How did the first life on Earth lead to the diversity of organisms on Earth today?
A. evolution
B. asexual reproduction
C. extinction
D. All answers are correct.
E. stasis of the evironment
Answer: A. evolution
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Why did the average body weight of sociable weavers move in a stabilizing direction? a. Predators killed birds of medium body weight
b. Meager food supply selects against all birds equally. c. Predators randomly killed the birds. d. Meager food supply selects against birds of high body weight. e. Predators killed birds of high body weight.
Four primary factors affect the size of a population of a particular species. Which of these is not one of those major factors?
a. deaths b. births c. mitigation d. emigration e. immigration
Fungal diseases are difficult to treat because they are very closely related to protists.
Indicate whether the statement is true or false.
Agricultural companies have developed the ability to control the genetic characteristics of their crops. Genetic engineering techniques have been used to produce all of the following effects except
A. grow salt-tolerant crop plants B. decrease harvesting time C. make crop plants resistant to disease D. decrease soil nitrogen levels