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Alona [7]
3 years ago
7

The formation of the fertilization envelope (slow-block to polyspermy) requires an increase in the availability of _____.

Biology
1 answer:
jok3333 [9.3K]3 years ago
7 0
<span>The formation of the fertilization envelope (slow-block to polyspermy) requires an increase in the availability of </span>calcium ions.

Slow-block to polyspermy is also called cortical reaction. In this reaction, the sperm will be permanently blocked by cortical granules. The release of calcium ion will trigger this reaction.
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Which of the steps in this sequence of events is an example of mitosis at work?
taurus [48]
<span>The bruise slowly disappears as the arm heals.

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<span>The two identical daughter cells resulting from mitosis and cytokinesis are identical in the following ways:1. Mitosis occurs when the nucleus of the cell divides into two identical nuclei, each with the same type and number of chromosomes. The cell's DNA is duplicated during this phase. Sometimes the cell's DNA isn't copied properly resulting in cancer-type cells. 2. Cytokinesis is when the cytoplasm divides into two identical daughter cells. Each cell is genetically identical and both are a similar size.
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7 0
2 years ago
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HELP ASAP!!!! All life on earth has descended from a common ancestor this theory was accepted when
kap26 [50]

Answer:

A. A majority of scientists agreed with it

Explanation:

The famous theory called the theory of common descent, states that all the living organisms of the earth have arisen from a common ancestor. This notion was first proposed by a French mathematician,Louis Maupertuis duirng 1740s who was of the view that all organisms had a single ancestor and evolutionary process with the passage of time resulted in the specie diversification.

After that, in 1790s another philosopher Immanuel Kant, suggested that all organisms seem to have a common ancestor. In the same period of 1790s, another scientist , Erasmus Darwin who was the grandfather of Charles Darwin also suggested that all the organisms might have a single ancestor who went through the process of evolution to bring all the majesty into life.

Charles Darwin was the first scientist who worked on this notion for alot of time and proposed the theory of common descent,in his book, On the Origin of Species.

After it, many scientists got agree with this theory such as,  Vernon Kellogg in 1907 and T. Ryan Gregory in 2008 and many others explain that no reliable observations exists which contradicts the theory of common descent.

Therefore, option A is the best option.

Hope it helps!

4 0
3 years ago
A 40-year-old client is admitted to the hospital after experiencing 3 days of extreme vomiting. The doctor reviews the lab resul
trapecia [35]

Answer:

The cause is likely Manifestation of dehydration

Explanation:

The hematocrit measures the red cell mass in a 100-mL plasma volume. The hematocrit may be deceptive because it varies with the quantity of extracellular fluid, rising with dehydration and falling with over expansion of extracellular fluid volume. The client is manifesting an abnormal elevation as a result of fluid loss.

8 0
3 years ago
Coral reefs have the highest biodiversity of any marine ecosystem on Earth. Hundreds of plant and animal species live in close a
Ostrovityanka [42]

Answer:

B.

that the biodiversity of the coral reefs will decrease if global temperatures continue to increase.

Explanation:

Coral reefs are believed by many to have the highest biodiversity of any ecosystem on the planet—even more than a tropical rainforest. Occupying less than one percent of the ocean floor, coral reefs are home to more than twenty-five percent of marine life.

5 0
2 years ago
When a substance changes into a different substance, a _____ change has occurred.
Yuri [45]

a phase change occurs

e.g ice into water

4 0
3 years ago
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