Which of the following is true about membrane filters?
A. It can't be depended on to remove all viruses from liquids.
B. It does not truly sterilize because it removes rather than kills microorganisms.
C. It can be used only to remove organisms from liquids and it does not truly sterilize because it removes rather than kills microorganisms.
D. It can be used only to remove organisms from liquids.
Answer: A
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Many plants and animals can reproduce asexually
A. true B. false
The rate of diffusion is influenced by ________.
Fill in the blank(s) with the appropriate word(s).
How are the algae economically important?
A. They increase environmental calcium levels. B. They decrease the population of harmful fungi. C. They provide fiber in most diets. D. They provide food additives.
At which gestational age does a developing human fetus first look obviously human and not like other vertebrate embryos?
A) 2 weeks B) 4 weeks C) 9 weeks D) 4 months