How did the first life on Earth obtain energy?

A. photosynthesis in the presence of oxygen
B. photosynthesis in the absence of oxygen
C. heterotrophic consumption of organic molecules
D. autotrophic consumption of organic molecules
E. phototrophic consumption of inorganic molecules


Answer: C. heterotrophic consumption of organic molecules

Biology & Microbiology

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Edward Jenner injected individuals with ____ lesions to protect them from ____

a. chickenpox; smallpox b. smallpox; chickenpox c. smallpox; cowpox d. cowpox; smallpox e. cowpox; chickenpox

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Sodium has 11 electrons arranged in three energy levels. In order to become stable, sodium forms an ion with:

A. no charge. B. -1 charge. C. +8 charge. D. +1 charge. E. -8 charge.

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What are the disadvantages to being a social animal?

What will be an ideal response?

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True or False: A carbon atom can form up to three single covalent bonds with other atoms.

Answer the following statement true (T) or false (F)

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