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sergey [27]
3 years ago
5

Why do veins have valves

Biology
1 answer:
Dimas [21]3 years ago
4 0
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
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Select all that apply. Which of the following products are derived from invertebrates? food shell jewelry silk cotton
asambeis [7]
The products that are derived from invertebrates are the following:
1. food - crabs, lobsters, oysters, octopuses: all of these are invertebrates (meaning they have no spine) and are used as food
2. shell - seashells are invertebrates and their shells are used for various purposes
3. jewelry - shells are used as jewelry, as well as pearls coming from seashells
4. silk - silk comes from silkworms, which are invertebrates
I just wouldn't pick cotton, because you get cotton from a plant.
5 0
3 years ago
Part B
Serjik [45]

Answer:

Cell division is a process that makes our skin, tissues, muscles, sex cells. It is the building block of our body.

Explanation:

When parents cells ahs been divided into two or more than two daughter cells then it is called division of cells. The division of cells occur as a larger cell. When we talk about eukaryotic cells, these cells divided into two distinct types of the cells, the vegetative cells.

The daughter cells are the identical to the parents cells genetically. There are two types of division such as mitosis and meiosis. When parents cells divides in daughter cells and daughter cells divided further, this process called the cells cycle. The mitosis cell division occur interphase. Meiosis cell division occur in two phase meiosis I and meiosis II.

3 0
3 years ago
Read 2 more answers
What is the phenotype of "Pp" for flower color on Figure 14.1?<br>​
maria [59]

Answer:

Pp would indicate heterozygous Dominant

Explanation:

6 0
3 years ago
Why does an epithelium need to be highly regenerative?
ycow [4]
As epithelial makes the outer covering of all the organs and skin is also made of epithelial...so to be sure that it does not get depleted or destroyed due to friction and other external cause ...it should be highly generative !
8 0
4 years ago
Which element would most likely have an electron affinity measuring closest to zero?
Keith_Richards [23]

Ar(Argon) have an electron affinity measuring closest to zero .

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