Which term refers to a large opening on a sponge through which water flows?
a. Osculum
b. Spicule
c. Mesohyl
d. Mesoglea
a. Osculum
Osculum refers to a large opening on a sponge through which water flows.
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Why was Escherichia coli thought to be a dominant member of the human gut microbial community in the past? What populations ARE important in the human gut and what evidence do we have that the specific bacteria present are important for human health?
What will be an ideal response?
As part of the previous experiment, you monitor the growth of tree A (ants blocked from the canopy) and tree B (ants are not blocked from the canopy) over the three-year period. You expect __________ because _________
A. higher growth in tree A; the number of aphids will fall because ants are absent, and aphids are parasites of the tree B. higher growth in tree B; the natural environment is always optimized so any change (e.g., blocking the ants from tree A) will reduce the performance of all members of the network C. no change in growth; due to the size difference between the trees and the insects, the presence or absence of insects will not have an effect on tree growth
Which of the following is the last structure that
a sperm travels through as it leaves the body? a. ureter b. urethra c. vas deferens d. ejaculatory duct e. epididymis
Blood plasma contains all of the following BUT
a. proteins. b. several types of blood cells. c. platelets. d. fluid. e. lipids.