what method can scientists use to determine when the fossil above appeared on earth?

Answer:

false 100%

Explanation:

Answer:

fungus

Explanation:

Among the options provided, a fungus is the decomposer.

In nature, decomposers play a critical role in recycling nutrients. They break down the remains of dead organisms and organic waste. Among the given options:

Therefore, the correct answer is fungus.

Answer:

The sinking of cold air creates regions of high pressure and this air travels to lower pressure regions produced by the rising motion of warm air. This process results in air circulation.

Explanation:

the reason why asthma could cause this symptom is because the asthmatic bronchiole is much narrower than the normal bronchiole, and it's filled with mucus. If there isnt a sufficient amount of air getting through the lungs for gas exchange, the person will need to have heavier breaths to compensate.

Answer:

The asthmatic bronchiole is much narrower than the normal bronchiole, and it’s filled with mucus. If enough air does not get to the lungs for gas exchange, the person will need to breathe heavily to compensate.

Explanation:

PLATO answer

Answer:

nucleotides

The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.

Explanation:

Final answer:

Inbreeding among the remaining individuals of an endangered species may lead to a reduction in genetic diversity, causing inbreeding depression and increasing the risk of extinction.

Explanation:

One concern with allowing the few remaining individuals of an endangered species to breed is that it may lead to a reduction in genetic diversity. Inbreeding, which is the mating of closely related individuals, can often cause adverse effects known as inbreeding depression. This mating strategy tends to bring together deleterious recessive mutations, which can result in abnormalities and increased susceptibility to diseases. For example, if a rare recessive allele causing disease is present within a population, the likelihood of two carriers mating and passing the disease to their offspring increases dramatically when the population size is small and inbreeding occurs. Therefore, the option that correctly completes the statement on how inbreeding over a short period of time may lead to species extinction is through the reduction of genetic diversity.

Answer: Nucleotide

Explanation: It is a monomer composed of the following parts: a phosphate group, a nitogeneous base either ( A,G,C,T) and a pentose sugar.

Answer:

A

Explanation:

Gases are released from volcanic eruptions.

And took test (:

Answer:

key difference between dominant and recessive alleles is that dominant alleles are the alleles that give the phenotype, masking over the other phenotype, while recessive alleles are the alleles that are suppressed by the dominant allele.

Explanation:

Final answer:

A dominant allele is expressed in an organism's phenotype even if only one copy is present, while a recessive allele is only expressed if two copies are present. This expression pattern determines the visible traits, with dominant alleles masking recessive ones in heterozygous individuals.

Explanation:

Difference Between Dominant and Recessive Alleles

The main difference between a dominant allele and a recessive allele lies in their expression in an organism's phenotype. A dominant allele is always expressed in the phenotype even if just one copy is inherited. In contrast, a recessive allele can only be expressed in the phenotype if two copies are present. This means that in a heterozygous individual (one who has different alleles at a particular gene locus, such as 'Aa'), the dominant allele (A) will mask the expression of the recessive allele (a).

As an example, if we consider the ABO blood group system, an individual inheriting one allele for blood type A and one for blood type O will have the blood type A because A is dominant over O. Meanwhile, for a person to have blood type O, a recessive trait, they must inherit two O alleles.

It is important to understand that dominance does not imply superiority or higher frequency in the population but simply reflects the mechanism of inheritance and expression of certain characteristics. Indeed, the same allele can be dominant in relation to one allele and recessive to another, illustrating the context-dependent nature of these terms.

Answer:

how are genes expressed for a particular trait?

Genes are expressed in two ways which could be either genotype or phenotype

genotype reflects the dominancy or recessives of a particular trait over another while phenotype entails the physical expression of such trait which could be height, color of skin among others

e.g

If P is purple while p is white

PP x Pp= PP, Pp, PP. Pp these are the genotype produced from the crossing of two parents which results into 2 homozygous gene and 2 heterozygous gene without any recessive gene

while the phenotype shows that all the offspring are Purple

Explanation:

I think C. Many scientists believe it is correct. because a theory can not be proven therefore some we'll educated scientists could still reasonably believe the theory to be false, even when I hasn't been proven incorrect.

Answer:

dormancy is the state of having functions slowed down for a period of time.

The bacteria which had mutation became resistant to the antibiotic and survived and keeps on increasing, promoting natural selection.

Explanation:

The bacteria rapidly divide, the chances of mutation in the gene increases manifold.

The strains of bacteria causing tuberculosis and staph infection got mutated at DNA level such that they became resistant to antibiotics when tested those susceptible did not survive. These mutations were not harmful to bacteria and the resultant bacteria survived.

These bacteria which survived and proliferated as the environment was in their favour.

Thus, Darwin's Theory of Natural Selection is acceptable here as it says if a mutation is occurring towards the increase in population, they will be selected ones.

Answer:

The product of the DNA synthesis reaction is that, from a DNA molecule, two identical molecules of this nucleic acid are obtained.

Explanation:

The DNA replication process involves a series of events that result in obtaining two DNA molecules with the same sequence of nitrogen bases relative to the original.  This must occur previous to the process of cell division, so that each cell daughter possesses the same genetic information.

For this process to occur the double DNA chain must be unrolled and, from each of the simple chains a complementary chain is formed, by adding complementary nitrogen bases: adenine with thymine and cytosine with guanine. DNA synthesis is facilitated by the action of the enzyme DNA polymerase.

DNA synthesis is called semi-conservative, as each molecule obtained in the process has a simple chain, coming from the original molecule, and a new synthesized chain.

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Final answer:

The product of DNA synthesis is two identical DNA molecules, comprised of one original strand and one new strand. This replication process ensures genetic information is preserved.

Explanation:

The product of a DNA synthesis reaction is two identical DNA molecules, each consisting of one original and one newly synthesized strand. This process, known as replication, occurs within the nucleus of a cell during the S phase of the cell cycle. Enzymes such as DNA polymerase play a pivotal role in this process, 'unzipping' the original double helix to use as templates for synthesis. Free deoxynucleoside triphosphates (dNTPs) are aligned opposite their complementary bases on each template strand, and DNA polymerase catalyzes the addition of these nucleotides to the 3' end of the growing chain. Thus, each daughter DNA molecule is an accurate copy of the parent DNA, ensuring genetic information is preserved during cell division.

Answer:

The central idea of "Against all odds: Earths fragile pioneers" is how Hawaii which is the most isolated island group on earth slowly was colonized by plants and animals.

Explanation:

Answer:

he Hala seeds can float in the ocean for so long because they have a blanket of spongy material, which help is Hala seeds float. I know this because in the text it says “How do its seeds survive the salty ocean? They are snuggled in a blanket of spongy material, which can float in the sea for months or even years. A species of Hawaiian crickets rafted in on pieces of floating wood.  This supports the central idea because it shows how   difficult it is for the colonize to get to Hawaii.

Explanation:

Answer/ Explanation:

Punnett squares attached.

1. A.The punnett square shows the cross between two Ff heterozygous plants. The resulting plants are 25% FF, 50% Ff and 25% ff. This means that there are 25% red, 50% pink, 25% white.

B. In a population of 200 plants, we would expect 50 red, 100 pink, and 50 white.

2. A. The punnett square shows a cross between two Zz heterozygous mice.

B. If there is a phenotype missing from the offspring, we can assume that for some reason the genotype is lethal. That means that we can't see any with the phenotype because none of them survive past birth. Therefore, the third coat colour could be lethal.

4. Punnett square attached.

Genotype of a heterozygous black coated rabbit is CBc

Genotype of a homozygous white coated rabbit is CWCW

The genotypes and phenotypes of the offspring are CBCW (black and white spotted), CWc  (white), CBCW (black and white spotted), CWc  (white)

5. Punnett square attached.

Lets say that the hemophilia allele is h and the normal allele is H. Mrs Eryth is XHXh, Mr Eryth is XHY. The genotypes and phenotypes of their children are: XHXH (normal non-carrier female), XHXh  (normal but carrier female), XHY (normal male), XhY  (affected male)

Answer:

slow changes allow time for  adaptation

Explanation:

Answer:

b leech

Explanation:

Answer:

The answer is B

Explanation:

It is B because leeches suck our blood so when a blood clot appears ( a gelatinous mass of fibrin and blood cells formed by the coagulation of blood ) They can fix it by sucking our blood.

The answer isn't B. I think the answer is D.

Answer:

An example of a land feature formed by river erosion is alluvial fans

Explanation:

Alluvial fans entails when water caused an erosion on land and makes it to form a likely shape of triangle.

Answer: D

Explanation:

Erosional landforms include V-shaped valleys, interlocking spurs, waterfalls and gorges. Meanders and oxbow lakes are formed from erosion and deposition. Depositional landforms include floodplains

Answer:

The two types of cells those contain chloroplasts are plant cells and algae.

Explanation:

Final answer:

Plant cells and algal cells are the two types of cells that contain chloroplasts, which are organelles responsible for photosynthesis.

Explanation:

Two types of cells that contain chloroplasts are plant cells and algal cells. Chloroplasts are special organelles where the process of photosynthesis takes place, using chlorophyll to convert solar energy into chemical energy in the form of glucose, which serves as food for the plant. In addition to plant cells, some groups of eukaryotes called algae also contain cells equipped with chloroplasts. Like plant cells, algal cells can have one or more chloroplasts, which are important for their photosynthetic activities.

Photosynthetic cells in plants are typically found in the mesophyll, the middle layer of cells in leaves. In aquatic environments, algae harness light energy with the help of chloroplasts as well. The presence of chloroplasts is fundamental to these organisms, as it allows them to produce their own food through photosynthesis, defining their role as autotrophs within ecosystems.

Answer:

The model representing this relationship is : Prey-Predator Relationship.

Explanation:

Answer:

As a tiger grows his genes change

Explanation:

Development from a fertilized egg to a mature organism depends on the expression of different genes at different times. In addition, gene expression can occur in different parts of the body at different times during development. As the fertilized egg begins to divide, different genes are either turned on or off. The activation of specific genes is the most important step in cell differentiation. As the tiger grows and develops, different genes are either turned on or off in the tiger’s various cells. This regulation is a key part of development and differentiation.  

Answer:

Having more fast-twitch muscle fibers is one factor that contributes to muscle strength. Another factor that determines strength is muscle mass. People with larger muscle cross-sectional areas can generate greater amounts of force. This should come as no surprise.

Explanation:

The solution regarding the Mechanical waves and electromagnetic is discussed below:

Answer:

The correct option is D) They soak up excess water that can potentially lead to flooding.

Explanation:

A rain garden can be described as a depressed area in a landscape which comprises of plants like native shrubs and flowers. The primary purpose of building a rain garden is to hold and soak in rainwater. This causes to prevent a situation such as a flood because most of the excess water is trapped by the plants. Hence, situations such as erosion and flooding can be decreased by rain gardens.

Answer:

here are several methods of separating mixtures. The common ones are:

 1. Winnowing

The wind is used to separate wharves (chaff), small sticks, and dry leaves, from grains or seeds by blowing the chaff away.

Chaff is usually lighter than the grains.2. Sieving

a sieve is used to separate mixtures of particles of different sizes. For example stones from flour.

The larger particles remain on the sieve while the finer ones pass through.

3. Picking

Here the large particles are separated from smaller ones by observing them and using the hands to remove the unwanted ones.

For example, stones are separated from rice or beans in this way.

4. Filtering

This method is used to separate a liquid from particles that cannot dissolve in it.

For example, separating sand from water using filter paper or piece of cloth.5. Decanting

This is when a liquid is separated from large particles of solids by pouring the liquid out gently.

For example, pouring off kerosene that has mixed with tiny ball bearings.

Explanation:

The best procedure for separating a mixture of maize, bean, and sugar involves physical and chemical separation techniques such as hand picking, sieving, magnetism, dissolving, filtering, evaporating, and density gradient.

The best procedure for separating a mixture of maize, bean, and sugar is using a combination of physical and chemical separation techniques. Here is a step-by-step process:

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Answer:

the system of nomenclature in which two terms are used to denote a species of living organism, the first one indicating the genus and the second the specific epithet.

Explanation:

Final answer:

Binomial nomenclature is a system of naming species with a two-part Latin name consisting of the genus name and species identifier. Developed by Carolus Linnaeus, it provides a unique and universally recognized name for each species, avoiding the confusion of common names and facilitating clear communication among scientists worldwide.

Explanation:

Binomial nomenclature is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms, although they can be based on words from other languages. This two-part name is called a binomial (meaning "two names" in Latin). The first part of the name identifies the genus to which the organism belongs, while the second part identifies the species within the genus. For example, the scientific name for humans is Homo sapiens, where Homo is the genus and sapiens is the species identifier.

The Swedish naturalist Carolus Linnaeus is credited with developing binomial nomenclature in the 18th century, which revolutionized the way scientists named and classified organisms. It enabled clearer and more consistent communication among scientists from different regions and languages. When printed, the genus name is always capitalized and the species name is always lowercase, and both are italicized, for example, Felis catus for the domestic cat.

The convention of binomial nomenclature not only mitigates the confusion caused by local and common names but also provides each species with a unique and universally recognized name. This universal nomenclature facilitates accurate communication and information sharing among biologists and researchers across the globe.

Each parent has a 50% chance of passing down the O gene. So each child has a 25% chance of ending up with an O blood type.

An AB and O couple producing an AB child cannot be explained in terms of the usual inheritance patterns. One would not expect the cord blood result to be AB when the mother is type O.

Thus, there is 25% possibility.

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Answer:

It can burn branches and clear wood from the forest floor.

Explanation:

This provides space for growth.

Answer:

A fire in a forest ecosystem can burn low branches and clear dead wood from the forest floor, providing space for new growth.

Explanation: