The variables that investigators try to keep the same for both the experimental and the control groups are
(a) independent.
(b) controlled.
(c) dependent.
(d) a and c.
(d) a and c.
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Blood contains
(a) dissolved gases. (b) dissolved nutrients. (c) dissolved hormones. (d) all of the above.
Around 1914, ________ determined that DNA was an important component in ________ by using a staining technique that is still in use today.
Fill in the blank(s) with the appropriate word(s).
In an apple seedling, what is the function of a lateral meristem?
a. increasing the diameter of stems b. protecting new leaves and shoots c. discouraging predatory animals d. ensuring regular seed production
What is the major assumption of the exponential model of population growth?
a. resources are unlimited b. organisms selectively choose their mates c. the death rate equals the birth rate d. biotic potential is limited e. density-dependent factors are at work