During cold temperatures, the testes are pulled closer to the pelvic floor and the warmth of the body wall, and the scrotum becomes shorter and heavily wrinkled. True / False.

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Answer 1

Answer:

Answer:

the statement is true .

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Which of the following is an example of a limiting factor? A. A prolonged droughtB. Heavy rainfallC. A small pond

Which statement about cellular respiration is true?

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The answer is : They are complex chemical reactions

I hope that's help !

I hope my answer is one of the choices :)

Answer:

It is used by every living cell

Explanation:

edge 2020

From a population of red brown orange yellow and green butterflies only the red and green ones survive since they can blend into their environment and reduce predation. Which evolutionary mechanism is involved?

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The answer is natural selection. Since the brown, yellow, and orange butterflies aren't able to blend into their environment their genes wont be passed down to the next generation.

The trait of the Red and green the trait to be able to blend into the background.

Distinguish between diffusion and equilibrium

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Diffusion is the movement of molecules across a semi permeable membrane. And and equilibrium is when two influences of different substances cancel out each other.

What is homeostasis?

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The ability for an organism to be able to regulate its own body temperature from the outside world.

Homeostasis is the tendency of a living organism to maintain its body temperature according to conditions or environment.

Identify the correct order in which breast cancer develops. A) mutiation of normal cells-tumor growth-invasions of tissues-metastasis-metastatic tumor . B) invasion of tissues-metastasis-mutation of normal cells-tumor growth-mestastatic tumor. C) metastasis-mutation of normal cells-invasion of tumor-mestastatic tumor-tumor growth.

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The correct order in which breast cancer develops is option A: Breast cancer starts with the mutation of normal cells and then when these normal cells mutate, the grow in number, produce lumps and become tumors, these tumors then invade other tissue for nutrients, then metastasis then to metastatic tumor.

Why are catfish and carp found at the mouth of a river, while trout are found nearer the source?

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Answer:

The correct reason would be "the levels of dissolved oxygen at the mouth of the river and at the source of the river".

The mouth of the river is the region where it flows into the ocean, lake, another river, reservoir, sea et cetera. The level of dissolved oxygen in this region is too low to support great biodiversity.

Organisms like catfish and carp can survive here due to their low oxygen demand. For example, catfish can survive in water with an oxygen content of 2.5 parts per million.

In contrast, the level of dissolved oxygen is higher at the source of the river. Organisms like trout are found here due to their high oxygen need. For example, rainbow trout require minimum 5-6 parts per million dissolved oxygen for its survival.

Catfish and carp require less oxygen than trout. The mouth of a river usually has less oxygen and the area closer to the source has more oxygen, so since catfish and trout require more oxygen they typically are found at the source.

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