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Zinaida [17]
3 years ago
11

In the developing fetus, the umbilical __________ carries blood rich in nutrients and oxygen to the fetus.

Biology
1 answer:
vesna_86 [32]3 years ago
6 0
Cord? Or maybe vein. But I strongly believe it’s cord
You might be interested in
How can humans reduce the amount of endangered and extinct species?
Andrews [41]
There are many ways humans can reduce the amount of endangered and extinct species. However, I would say by reducing pollution and logging/mining. Nearly 318 species have become extinct due to pollution. The reduction of carbon emissions would be a good way to curb the amount of pollution produced by humans.
4 0
2 years ago
Bone resorption is a process whereby bone matrix is ____________ by substances released by ____________ . The lysosomes inside o
Nikitich [7]

Answer:

a. destroyed

b. osteoclasts

c. proteolytic enzymes

d. hydrochloric acid

e. blood

f. low

Explanation:

Resorption is the loss of substance from any mineralized tissue, mediated by cellular and humoral systems of their own. The four mineralized tissues of our economy, bone, cement, dentin (mineralized fraction of the dentino-pulp functional complex) and enamel, offer different degrees of resistance to resorption. The bone has the greatest lability and the enamel the least. The fact that the bone tissue is the least resistant to resorption is used to move and reposition teeth by controlled forces (orthodontics); and the fact that the enamel is the most resistant has led to think that it does not suffer from resorption.

Osteoclasts They are the spring cells par excellence; they belong to the lineage of the monocitomacrophages. They are large, multinucleated mobile cells, with a clear area and a rough brush border that live for about two weeks and disappear by apoptosis (cell death programmed by fragmentation in membrane particles that allows their phagocytosis without inflammation). They are responsible for the destruction of the organic and inorganic parts of the mineralized bone fraction. They are active both in the processes of the physiological renewal of the bone and in those of its pathological loss.

8 0
3 years ago
A population of 500 rabbits lives in an area that is 25 square miles. What is
r-ruslan [8.4K]

Answer:

20 rabbits/square mile

Explanation:

No. of rabbits = 500

Area = 25 square miles

Density = 500/25

= 20 rabbits/square mile

7 0
2 years ago
What percentage of the earth is covered by water?
stepan [7]

Answer:

71 percent. hope this helps

Explanation:

7 0
3 years ago
One of the main reasons why mammals may have been able to evolve so quickly during the present era is due to the extinction of t
Allushta [10]

False, I'd say. Mammals usually adapt based on environment. Now, I know predators are "apart" of the environment, but I don't think that'd be it. I'd bet more money on saying mammals evolve based on environment adaptation. Sorry if I didn't answer your question or if I didn't get my point across well.

4 0
3 years ago
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