According to most paleoanthropologists, which of the following is true?

a. When modern humans arose, archaic humans disappeared worldwide.
b. Modern humans and archaic humans survived side-by-side for millions of years in Africa.
c. When modern humans arose, archaic humans disappeared in Africa.
d. Modern humans and archaic humans survived side-by-side for thousands of years in Africa.


Ans: c. When modern humans arose, archaic humans disappeared in Africa.

Biology & Microbiology

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Tris-BP was banned after the discovery that the chemical caused cancer in test animals and was ____________________ through the ____________________ by those wearing treated clothing

Fill in the blank(s) with correct word

Biology & Microbiology

Human activities are responsible for an increase in the amount of atmospheric carbon dioxide. Many feel that the buildup of this gas is at least partly responsible for the greenhouse effect and global warming. Increased carbon dioxide may actually be a benefit to some plants since they need carbon dioxide for carbon-fixation. How will the greenhouse effect influence the biosphere? Even though

experiments have shown increased carbon dioxide to be a boon for test plants, some scientists are still concerned about this phenomenon. Why? What will be an ideal response?

Biology & Microbiology

The part of the brain that directly controls secretions from the pituitary gland is the ___________

Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Which of the following is NOT a product of cellular respiration?

Carbon dioxide Energy (ATP) Oxygen Water

Biology & Microbiology