Over the past 500 million years, ____ mass extinctions have occurred in which at least ____ of the species on earth have become extinct
a. two...25%
b. two...50%
c. five...25%
d. five...50%
e. twelve...96%
Ans: d. five...50%
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The CRISPR system is said to protect or preserve genome integrity in prokaryotic cells by acting as a type of "immune system." Explain how the CRISPR system works and its limitations
What will be an ideal response?
What will the pH scale measure?
a. The amount of carbon in a solution b. The amount of hydrogen in a solution. c. The amount of protein in a solution. d. The amount of solute dissolved in a solution. e. The amount of nitrogen in a solution.
A relationship in which one species lives better in the presence of another species that is unaffected is called ____
a. commensalism b. competitive exclusion c. mutualism d. predation e. parasitism
Bananas are propagated by ____
a. grafting b. adventitious roots c. tissue culture d. treating banana tissues with colchicine e. planting seeds