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
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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.
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
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)
What are the disadvantages to being a social animal?
What will be an ideal response?