In order to obtain a stable outer shell of electrons, carbon forms four __________
Fill in the blank(s) with the appropriate word(s).
Answer: covalent bonds
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Which of the following is an important consequence of the evolution of diatoms and coccolithophorids?
A. They dominated photosynthesis in the oceans. B. The silica and calcium carbonate contained in these organisms became a primary source of carbonate sediments on the seafloor. C. They produced respective "blooms" in the ocean. D. They led to the extinction of cyanobacteria. E. None of these answer options is correct.
Which of the following conditions increases the risk of heat stroke?
a. all of the choices b. old age c. pregnancy d. diabetes
If a cell containing 20 chromosomes divides by mitosis, a total of how many daughter cells will be produced?
a. 1 b. 2 c. 3 d. 4 e. 5
Bacteria and Archaea are both domains consisting of prokaryotic organisms.
a. true b. false