In multicellular organisms, the mechanism most directly responsible for directing development and maintaining homeostasis is gene
A. regulation.
B. duplication.
C. deletion.
D. mutation.
Answer: A
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The 1997–1998 El Niño resulted in all of the
following EXCEPT a. crop failures and wildfires in Australia and Indonesia. b. the death of many seals and sea lions. c. massive flooding and landslides. d. a massive ice storm in the southwestern United States. e. massive flooding in California and Peru
____ is denser than ____
a. Heartwood; sapwood b. Heartwood; softwood c. Sapwood; hardwood d. Sapwood; heartwood e. Softwood; hardwood
Which vitamin, taken in amounts higher than the recommended upper limit, can have positive effects on blood lipid levels?
a. biotin b. thiamin c. vitamin D d. niacin
What two processes results in genetically-different products?
a)mitosis and meiosis b)mitosis and asexual reproduction c)meiosis and asexual reproduction d)meiosis and sexual reproduction e)mitosis and sexual reproduction