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zzz [600]
3 years ago
10

Egg laying land animals have evolved to produce eggs with tough shells to ensure that

Biology
2 answers:
9966 [12]3 years ago
6 0
The eggs survive and don't break easily.
Papessa [141]3 years ago
4 0

Answer:

To ensure that no drying of the embryo occurred.

Explanation:

Because of the inhospitable environment, eggs from terrestrial animals that had a thinner shell were very susceptible to desiccation of the embryo. This made it difficult for the species to continue because it caused the embryo to die and did not allow a new being to be generated.

Over time, as a way of overcoming this disadvantage, some of the land animals had evolved to make thick-shelled eggs. The egg of these animals has a thick shell that prevented the drying of the embryo. However, the shell was porous, allowing gas exchange between the embryo and the external environment, thus ensuring the survival of the species.

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Brilliant_brown [7]

Answer:

<em>The correct option is d) once the electrical impulse reaches a certain level of intensity (its threshold), it fires and moves all the way down the axon without losing any intensity.</em>

Explanation:

In the field of biology, the all-or-nothing law can be described as a principle which focuses on the strength with which a nerve or muscle fibre responds to a particular stimulus, this strength being independent of the strength of the stimulus. The functioning of the impulse is just like the trigger of a gun. The more the force of a stimulus, the more will be the intensity of the nerve impulse.

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I hope this helped!! :D

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