If a population shows little or no evolutionary change for millions of years it is said to be in a state of ________
a. adaptive radiation
b. stasis
c. extinction
d. decline
e. evolution
b
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How does an increase in atmospheric greenhouse gases increase global temperatures?
A. By reacting with each other B. By preventing some of the heat from escaping the planet's surface C. By decreasing the ozone layer in the atmosphere D. By increasing the amount of heat from the sun that reaches the planet's surface
Plants that have systemic acquired resistance (SAR) to a specific virus will be able to resist future infections whether or not the plant experiences necrosis in the first infection
A. true B. false
Three of the following statements are correct. Identify the statement that is not correct regarding genetically modified organisms
A) There are no risks associated with GM crops. B) GM crops have been produced with increased nutrition. C) GM crops have been produced that are disease resistant. D) GM animals are not in our food supply.
Gram ________ bacteria stain purple and have a very simple cell wall, only consisting of peptidylglycan:
A. Positive B. Negative