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laila [671]
4 years ago
9

What is the geological evidence that earth was covered with glaciers in the Precambrian???

Biology
1 answer:
Elenna [48]4 years ago
5 0

Answer:

Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. The Precambrian encompasses the Archean and Proterozoic eons, which are formal geologic intervals that lasted from 4 billion to about 541 million years ago, and the Hadean Eon, which is an informal interval spanning from 4.6 billion to 4 billion years ago. The Precambrian represents more than 80 percent of the total geologic record.

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Removing the layers that surround the oocyte is due to the action of ______ sperm, but ______ sperm will fertilize the oocyte
Lemur [1.5K]

Removing the layers that surround the oocyte is due to the action of 100 sperm, but one sperm will fertilize the oocyte.

<h3>How does the sperm fertilize the oocyte?</h3>

When sperm and an oocyte (egg) join, their nuclei fuse, resulting in fertilization. These reproductive cells combine to produce a diploid cell (zygote) since each is a haploid holding half of the genetic material required to become a human being.

The surviving capacitated sperm come into contact with the oocyte as it travels along the distal uterine tube and move toward it in response to chemical attractants secreted by the corona radiata cells. The sperm must get beyond the two protective layers to reach the oocyte itself.

The sperm first penetrates the corona radiata cells. The sperm then bind to receptors in the zona pellucida when they come into touch with it. This starts a process known as the acrosomal reaction, in which the sperm's acrosome, an enzyme-filled "cap," releases its reserve of digesting enzymes. These enzymes make it possible for sperm to get through the zona pellucida and reach the oocyte. Finally, a single sperm contacts sperm-binding receptors on the plasma membrane of the oocyte. The head and mid-piece of the "winning" sperm then enter the interior of the oocyte after the plasma membrane of that sperm fuses with the oocyte's plasma membrane.

Learn more about the process of fertilization here:

brainly.com/question/14140902

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4 0
1 year ago
What is the function of the fungal structure shown?
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Omnivores, because they eat both meat and plants, have a combination of sharp front teeth and molars for grinding.

Hope It Helps

Have a nice day

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