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77julia77 [94]
3 years ago
5

What are the main sources of fresh water used by humans

Biology
2 answers:
Ratling [72]3 years ago
5 0
Its only fram the ground water
AleksandrR [38]3 years ago
4 0
During early civilization, the main source of fresh water was from a river. Nowadays, we have reservoirs and lakes to get fresh water. <span />
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A group of tissues working together is _______. A. an organ B. a cell C. a compound D. an organelle
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A group of tissues working together is an organ.

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A. an organ
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Human populations in low-UV environments tend to have more lightly pigmented skin. One explanation is that the selective pressur
nikdorinn [45]

Answer:

Lightly pigmented people tend to be at higher risk of vitamin D deficiency

Explanation:

BACKGROUND KNOWLEDGE:

Human skin is the largest organ of the body which makes boundary line between environment and internal conditions.  Human skin cell produces pigment called melanin when ever it is subjected to Sun. More the melanin pigment produced more will be the skin darkens. Ultraviolet (UV) radiations also come from Sun and responsible for more pigmentation.

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The cholesterol associated with animal cell membranes
bekas [8.4K]

Cholesterol is one of the molecules composing the cell membrane. b) makes the cell membrane fluid at room temperature.  

<h3>What is the role of cholesterol in the cell membrane?</h3>

The cell membrane is composed of two lipidic bilayers, cholesterol, proteins, and glucans incrusted in between.

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brainly.com/question/2114495

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