The carbon-dioxide content in the earth's atmosphere before 1500 a. d. was between 200 and 300 ppm. the carbon dioxide
content today is about 450 ppm. which single historical development can be blamed for this increase?
select one:
o a. the election of george bush
o b. the industrial revolution
o c. splitting of the atom
o d. the invention of agriculture

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

Which topic is most likely to be studied by bo which topic is most likely to be studied by botanist? insect metamorphosis, viral infection, plant growth, animal physiology

Select the word from the list that best fits the definition apparent movement of a star used to measure its distance from earth