Suppose that you close a window because you notice that rain is falling. Your action in closing the window is a(n) A. involuntary reaction.
B. depressant.
C. stimulus.
D. response.

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

Our planet has experienced five major extinctions in the four billion year history of life. the first, 450 million years ago, occurred shortly after the evolution of the first land-based plants and 100 million years after the cambrian explosion. the second extinction occurred 350 million years ago, causing the formation of coal forests. next earth experienced two mass extinctions during the triassic period, between 250 and 200 million years ago. the fifth mass extinction occurred 65 million years ago, ending the reptilian dominance of the earth. according to richard leakey, the sixth mass extinction is happening right now. leakey suggests that we, the human race, are the cause. each year, at our hand, approximately 50,000 species vanish from earth. he believes that man is destroying earth at a rate comparable with the impact of a giant asteroid. leakey's statistics indicate that 50% of earth's species will become extinct within the next 100 years assuming leakey's hypothesis of a sixth mass extinction to be true, how will we expect the model to change? a) a sharp spike in the graph approximately 100 million years from now b) a dip in the graph, followed by a sharp spike about 100 million years from now c) a sharp spike in the graph immediately following the "0" location of the x axis d) a plateau following the "0" mark on the x axis, followed by a gradual rise to a new peak

Natalie’s white rabbit had a litter of six bunnies. four bunnies were black and two bunnies were white. the father of the bunnies is black. natalie wondered why there were more black bunnies than white bunnies in the litter. a. all of the black bunnies are male and the white bunnies are female. b. the fur color has nothing to do with the parents. it depends on the environment. c. the bunnies got more traits for fur color from their father than from their mother. d. there are fewer white bunnies because they do not survive as well as black bunnies. e. there are more black bunnies because father rabbits have stronger traits for fur color than mother rabbits. f. each parent contributed the same amount of information about fur color during reproduction. g. there must have been something wrong because black rabbits and white rabbits should produce grey rabbits.