The greenhouse effect is related to the phenomenon of an increase in average surface temperature known as
a. agricultural improvement.
b. global warming.
c. air pollution.
d. conservation.

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Acommon kind of mechanical weathering is called

Which type of stimulus do mechanoreceptors detect? sound pain heat light