What typically results from double fertilization in angiosperms?

When diatoms die, their shells fall to the floor of the ocean or lake that they inhabit and form sediments called diatomaceous earth (DE). Diatoms can be identified by their shells. Different species of diatoms prefer different water temperatures. What information can be gained if scientists take samples of long-existing DE and identify the diatom species that created it?

A plant has the following characteristics: a taproot system, several growth rings evident in a cross section of the stem, and a layer of bark around the outside. Which of the following best describes the plant?

Which of the following arise, directly or indirectly, from meristematic activity?

Which of the following pollinating agents is correctly matched with the type of plant it helps pollinate?

Imaging of the thyroid takes place:

When Tc99m pertechnetate thyroid imaging is performed, which of the following settings should be employed?

Pheochromocytomas and neuroblastomas are disorders of the adrenal medulla.

A patient with hyperparathyroidism will have:

Most people have four parathyroid glands.