Select two functions of the circulatory system.

a
to distribute blood throughout the body

b
to coordinate the actions of the body

c
to secrete hormones in different areas of the body

d
to transport oxygen to tissues throughout the body

e
to remove excess waste materials from the body

f
to the body respond to external stimuli

Marianne is comparing two animals: a fruit fly and a fruit bat. she asks, "do a fruit fly and a fruit bat share a common ancestor in their evolutionary history? " according to evolutionary theory, what is the answer to marianne's question?

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

Which structure in the cardiovascular system connect arteries to veins?