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iogann1982 [59]
2 years ago
12

Why are valves found in veins, but not in capillaries or arteries?​

Biology
1 answer:
mr_godi [17]2 years ago
8 0

Answer:

Aside from preventing back flow of blood, valves in the veins aid in the return of blood from the extremities to the heart ( from feet and legs in particular).

Explanation:

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In what type of reproduction do cartilaginous fish lay eggs?
Evgen [1.6K]

Answer:

Oviparous

Explanation:

The most common reproductive strategy in marine ecosystems is oviparity. 43% of cartilaginous fish are oviparous.

5 0
3 years ago
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A cell can only grow so large in size, because
sweet-ann [11.9K]
<span>A cell can only grow so large in size because its ability to exchange materials is affected by a growing surface-to-volume ratio. Nature designed cells to be small in size because of the network of membranes passing through it. If cells grow any bigger, membranes in it will not be able to pass through its different parts and perform their purpose.


A cell is a network composed of many organelles (e.g. mitochondria, nucleus), that communicate and work together to provide bodily functions. The cell is small so that communication between organelles will be faster and much easier. When cells are small they can be easily repaired when damaged and replicated when needed.</span>
6 0
3 years ago
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Why are there no samples of rocks from the early Precambrian era?
xenn [34]

Answer:

The correct answer is -  D. All rocks were molten in that time period.

Explanation:

The early Precambrian era began 4.6 billion years ago. The formation of eath start from this era with dust and gas. The atmosphere at that time was too hot. It was like hades. The rocks were molten and appear to like an ocean of rocks.

Due to the molten rocks, there are no samples of rock from this area as it was too hot to be formed. There were boiling sulfur and gases were everywhere.

4 0
3 years ago
The production of four haploid gametes from one mother cell is completed during
Rudik [331]
This is a product of meiosis
7 0
3 years ago
Which of the following statements about plankton or nekton is NOT correct?
Oduvanchick [21]

Answer:

C. All plankton are closely related to plants.

Explanation:

Plankton are organisms found in water that exist in a drifting state. They are too small or weak to swim on their own, so they let the current or tide carry them. They are usually microscopic but include larger species as well, such as some crustaceans and jellyfish.

Phytoplankton are autothrophic plankton. This means that they produce their own food. They are primary producers and closely related to plants.

Zooplankton are heterotrophic plankton, which means that they feed on other organisms. They are animals and aren't closely related to plants.

Nekton are organisms found in water that swim actively.

Based on this information, we can conclude that statement C is the only incorrect statement.

6 0
3 years ago
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