Pulmonary circulation is the flow of blood to and from the
a. stomach
b. liver
c. intestines
d. lungs
Ans: d. lungs
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What is the best description of double fertilization in angiosperms?
A. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the ovary, which becomes the fruit. B. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the endosperm. C. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the seed coat. D. One sperm fertilizes the egg, which develops into the embryo; the other sperm produces the pollen tube. E. One pollen grain fertilizes the embryo sac; the other sperm fertilizes the pollen grain.
The Earth's largest phylum is Arthropoda, including centipedes, millipedes, crustaceans and insects. The insects have shown to be a particularly successful class within the phylum. What biological characteristics have contributed to the success of insects? In many science fiction scenarios, postapocalyptic Earth is mainly populated with giant insects. Why don't we see giant insects now?
What will be an ideal response?
Herbivory is an example of a ________ interaction
A) +/+ B) -/- C) 0/+ D) +/-
When the lac repressor is bound to allolactose, it can bind to the lac operator.
a. true b. false