Final answer:
In double fertilization, one sperm cell fertilizes the egg cell to form a diploid zygote while another fertilizes the two polar nuclei to create a triploid endosperm, both of which are essential for the development of the seed in angiosperms.
Explanation:
The process you're inquiring about is double fertilization, which is a unique mechanism in angiosperms, or flowering plants. During this process, two structures are fertilized. The first is the egg cell, which, upon fertilization by one of the sperm cells, forms a diploid zygote. The second structure consists of the two polar nuclei found within the central cell of the ovule, which are fertilized by the second sperm cell to form a triploid endosperm. This endosperm will eventually provide nourishment for the developing embryo within the seed.
In the subsequent stages, the zygote divides to form two distinct structures: one develops into a suspensor, which anchors the embryo and facilitates nutrient uptake, and the other into the proembryo that eventually differentiates into the plant embryo. Following these events, the fertilized ovule develops into a seed which contains the embryo, and the surrounding ovary tissue matures into the fruit.
Sam noticed every time she rolled a ball on a flat surface it did not stop unless she
applied a force on it. This happened multiple times. The outcome never changed. Would you classify this as a law or theory? Why?
what is the independent variable in this experiment
Answer: yes the expert is right
Explanation:
Final answer:
The independent variable is what the researcher manipulates in an experiment to see its effects on a dependent variable, such as applying different amounts of a new fertilizer to see its impact on plant growth.
Explanation:
The independent variable in an experimental study is the factor, property, or condition that the researcher manipulates or changes purposefully to explore its effects on a dependent variable. For example, if a researcher is testing the effects of a new fertilizer on plant growth, the type and amount of fertilizer applied (the treatment) would be the independent variable. The growth of the plants, which the researcher measures, would be the dependent variable. The researcher controls and changes the independent variable and then observes any changes in the dependent variable to determine the impact. In a typical experimental setup, the independent variable is introduced to the experimental group but not to the control group, which allows the researcher to compare the effects. It is crucial to hold all other factors constant so that any observed changes in the dependent variable can be attributed to the manipulation of the independent variable. For instance, using the previous example of plant growth, light, water, and soil conditions would need to be kept constant barring the fertilizer application.
Which of these processes is used to break down glucose into ATP that is usable by the cell?
A) chemosynthesis
B) photosynthesis
C) respiration
D) transpiration
Which of these is a hypothesis?salmon are kept in their natural habitat and treated with fungicides whenever infected.the yield of salmon is 2,000 kilograms in the month of april and 1,500 kilograms in the month of october.salmon are more prone to infections during the summer than in other seasons.?
The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). What is the probability of a man with a straight hairline (ww) and a woman with a widow’s peak (WW) having an offspring without a widow’s peak?
0 percent
75 percent
25 percent
50 percent
Option A is the correct answer.
D. 0 percent
Explanation:As the widow's peak is dominant over straight hairline (w). And the mother is homozygous recessive dominant for widow's peak. So, her all children receive one dominant W from their mom so they all will be having widow's peak.
Explain why molecules held together by covalent bonds don't have electrical charges
You visit a farm and notice that white chickens lay white eggs and colored chickens lay brown eggs, so you decide that only white chickens lay white eggs. What type of reasoning is this?
a) inductive
b) deductive
Answer
Inductive
Explanation
Its a logical process in which a number of premises all believed true or sometimes found true most of the time and combined to come up with specific conclusions. Its mostly used in applications that do involve behavior, forecasting and makes broader generalization that is considered probable. For example a speculation that all crows are black and each time a new crow is observed and found out that its black the assumption is increasingly confirmed. On the other hand if the crow is found not to be black then the assumption's found to be false..
Which statement is an accurate description of the relationship of rocks and minerals? A. All minerals are made of rocks. B. Geologically, minerals and rocks are exactly the same. C. Knowing which minerals are in a rock can help you identify and classify that rock. D. Almost all rocks are made of three or more minerals.
Final answer:
The relationship between rocks and minerals is that identifying the minerals within a rock helps to classify and identify it; rocks consist of minerals, which are their basic building blocks. So the correct option is C.
Explanation:
The question concerns the relationship between rocks and minerals in geology. The accurate description of this relationship is that knowing which minerals are in a rock can help identify and classify that rock. Rocks are aggregates of minerals, and most rocks are composed of a few common minerals, although some rocks are made up solely of one mineral. Minerals are the basic building blocks of rocks, and identifying the minerals within a rock is a fundamental skill for geologists. While seven common minerals make up 84% of the Earth's crust, there are over 5,000 known minerals that could be present in various types of rocks, including igneous, sedimentary, and metamorphic rocks.
Viruses living or non living
Chemical reactions that release energy are______________________
How can a mutation in DNA affect an organism?
Both the heart and arteries contract to pump blood throughout the body. true or false? True Both the heart and arteries contract to pump blood throughout the body. The heart contracts to move the blood flow through your arteries to the rest of the body
Answer:
TRUE
Explanation:
Which of the following could be a nucleotide of DNA?
deoxyribose + phosphate group + thymine
deoxyribose + phosphate group + uracil
ribose + phosphate group + thymine
ribose + phosphate group + uracil
which research question about the largemouth bass and whirligig beetle would best match the scientists' observations?
a.how log do fish spend rinsing their food?
b.what is the favorite food of a larrgemouth bass?
c.which insects produce the most foul-tasting substances?
d.does the slow release of a foul-tasting substance increase survival?
Transcribe the following DNA to RNA
DNA A G T C C T A T G A C C
mRNA ___________________________________
Select all that apply.
Problems with solar energy include _____.
the inability of current technology to capture large amounts of the Sun's energy
the inability of current technology to store captured solar energy
inconsistencies in the availability of the resource
lack of demand for solar energy
I just turned in my assignment and the answers are:
"the inability of current technology to capture large amounts of the Sun's energy"
"the inability of current technology to store captured solar energy"
"inconsistencies in the availability of the resource"
Hope this helps! :)
Which of the following statements about human impact on trees is true? a. Human activity always has a negative impact on trees. b. All human uses of trees require destruction of the trees. c. Human activity has had both a positive and negative impact on trees. d. Cutting down trees is the only activity that has a negative impact on trees.
i believe the answer is C
What is a place where poor woman and men worked separately for food from a Christmas Carol?
The question seems to be based on Charles Dickens' depictions of the harsh working conditions for men and women in factories during the Victorian era, though no specific place from 'A Christmas Carol' is mentioned. The conditions described are similar to those found in 'Hard Times' by Dickens, who used his work to provide social commentary on the injustices of the Industrial Revolution.
Explanation:The place mentioned in your question is not explicitly found in A Christmas Carol by Charles Dickens. Instead, it sounds like you’re asking about the working conditions depicted in Dickens' literature, such as in Hard Times, which describes the difficult lives of factory workers. In the Victorian era, which is when Dickens wrote, poor men and women often worked in factories under harsh conditions for very little pay.
The workers were segregated by gender and were subject to long hours, with meager food as part of their compensation. Women, in particular, faced additional challenges due to unequal pay and the likelihood of being sexually harassed or exploited.
These themes are common in Dickens’ work, which sought to highlight social injustices and the plight of the poor during the Industrial Revolution. While Dickens' novels are fiction, they provide important social commentary on the realities of the time, reflecting the poor living and working conditions, as well as the limited opportunities available to women, leading to some engaging in desperate measures such as 'treating' in order to survive.
What disease causes an imbalance of the blood glucose levels
Create a sentence explaining how amino acids form proteins
Amino acids are monomers that combine to form polymers called proteins.
Locations in this region where major earthquakes occur are most closely associated with areas of
Final answer:
Major earthquakes are most closely associated with areas near tectonic plate boundaries, including the Pacific Ring of Fire, Mediterranean-Asiatic Belt, and regions where subduction occurs.
Explanation:
Locations where major earthquakes occur are most closely associated with areas near plate boundaries. Nearly 95% of all earthquakes take place along these boundaries, particularly around the Pacific Ring of Fire, which is known for a high incidence of earthquakes and volcanic activity. The Ring of Fire has convergent and transform boundaries and is home to most of the world's volcanoes. Another significant zone is the Mediterranean-Asiatic Belt, which experiences tectonic activity due to the Indian Plate colliding with the Eurasian Plate. Lastly, deep earthquakes in regions like northern Afghanistan are associated with the subduction process, where one tectonic plate is forced underneath another into the mantle.
Major earthquakes are not only concentrated directly on these boundaries but can also occur near them, on associated faults. Earthquakes are also common along divergent boundaries like mid-ocean ridges, and at transform faults such as the San Andreas Fault. Understanding the geologic setting of these regions is essential, as earthquake effects such as ground shaking, liquefaction, and landslides can significantly impact the local environments and human constructions within them.
_____are formed when two continental crust collide
Answer:
A mountain is formed.
Explanation:
The element hydrogen has three naturally occurring isotopes, H-1, H-2, H-3. What is the number of protons, neutrons, and electrons in H-3, or tritium?
Answer:
Tritium is one of the three isotopes of hydrogen which contains 1 proton, 2 neutrons, and 1 electron. Out of three isotopes, protium is the most abundant isotopic form of hydrogen constituting about 99.98 % of total isotopic form.
Tritium is a radioactive isotope of hydrogen having a half-life period of 12.3 years which is produced as a byproduct of fission in a nuclear explosion. Naturally, it occurs in a very trace amount.
It emits the beta particle which is having very low energy so cannot penetrate the skin but can be hazardous if inhaled or get absorbed in the skin.
Why did Gregor Mendel conclude that the genes for flower and seed color in pea plants independently assorted even though both traits are on the same chromosome?
Crossing over occurred frequently.
The genes are not considered linked.
The genes are very far apart on the chromosome.
All of the above are correct.
Cells of a multicellular organism are specialized. What does this statement mean?
A.
Cells of a multicellular organism can perform all the life functions the organism needs to survive.
B.
Cells of a multicellular organism perform all life functions but not at the same time.
C.
Cells of a multicellular organism are adapted for performing a specific function.
D.
Cells of a multicellular organism are specialized because they have a complex structure.
You are a scientist who discovers three new species of beetles in the jungles of South America. Describe, in detail, how a protein found in each of these beetles can be used to determine which species are more closely related ...?
Characteristics we use to tell the difference between kinds of matter are called ____________ properties.
The blank would be physical
hope this helps have a great day
The weather department in Richmond is forecasting a snowstorm. What is likely to happen to the barometer and thermometer readings in Richmond?
A. Barometer readings will decrease, and thermometer readings will increase.
B. Barometer and thermometer readings will increase.
C. Barometer and thermometer readings will decrease.
D. Barometer readings will increase, and thermometer readings will decrease.
E. Barometer and thermometer readings will not change.
The correct answer is option D. Barometer readings will increase, and thermometer readings will decrease.
The barometers are the devices, which are used for the measurement of the pressure and the thermometer is a device, which is used for the measurement of the temperature. During snowstorm, the temperate is decreased and the pressure is high. So, the reading on the thermometer would decreased, and the reading on the barometer would be increased.
Answer:
D.
Explanation:
Competition occurs between species when _____.
they fight for mates
their niche is destroyed
they try to share the same niche
a new niche becomes available
Answer: The correct answer for the fill in the blank is- They try to share the same niche.
According to competitive exclusion principle, two species when present in the same area, try to compete for the same limiting resource like food. The species having better advantageous trait over the other survive and exclude the other one. In other words, the second species is either eliminated or shifts to some other niche.
This principle is also called Gause's principle.
Thus, competition occurs between two species when they try to share the same niche.
Answer:
they try to share the same niche
Explanation:
2. Which organelle acts like the “brain” or control center of the cell?