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n200080 [17]
3 years ago
14

What statements are true about the circulatory and respiratory systems select all that apply?

Biology
1 answer:
pishuonlain [190]3 years ago
3 0
Hi! I can help you if you tell me what the options are that you have to select from. 
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Venoms and toxins are ____________ while others are components of ____________ or bacterial cell walls.
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Answer:

free molecules; plasma membrane

Explanation:

-Venom are complex mixtures of molecules called "toxins"

-Plasma membrane is the membrane found in cells that separates the interior of the cell from the outside environment

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Circadian rhythm refers to
strojnjashka [21]

Answer:

The correct option is B) a pattern of biological functioning that occurs on a 24-hour cycle.

Explanation:

Biological rhythm is defined as the regular variation of an organic function related to the course of time, circadian biological phenomena (around the day), are those with a period of approximately 24 hours.

Circadian rhythms are physical, mental and behavioral changes that follow a daily cycle (the biological rhythm), and that respond primarily to light and darkness in an organism's environment. This cycle close to 24 hours, allows to recognize the sleep-wake phenomena and their homeostatic action, in the systemic processes of every living being. The circadian system is composed of photoreceptors, pacemakers and efferent pathways that allow a regular functioning of the sleep and wakeful state.

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3 years ago
Which of the following describes an adaptation that relates to reproduction?
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Answer:

B. Elks attatch leaves and grasses to their antlers to help them appear larger.

Explanation:

Reason 1: If the Elk appears larger other male Elks would be too scared to fight that Elk for a female. Reason 2: The female Elk will be more attracted to the larger male Elk even if it's largeness is fake.

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