The pre-embryo becomes a hollow ball of cells with a fluid-filled cavity by about day 6 of development. This stage is called a ________
A) blastocoel
B) morula
C) blastula
D) blastocyst
D
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Many angiosperm species have ____ animal pollinators
a. competed with b. parasitized c. been driven to extinction by d. coevolved with e. antagonistic relationships with
The primary function of erythrocytes is to participate in immune reactions
Indicate whether the statement is true or false.
Which of the letters in the above figure represents
the anther where pollen is produced? a. A b. B c. C d. D e. none of these
Why may human populations surpass the carrying capacity of their environment?
A) temporary reliance on stored or nonrenewable resources B) sudden population crashes C) increases in death rates as the population growth approaches carrying capacity D) decreases in birth rates as resources are depleted