The smallest diagnosable group that contains all the descendants of a single common ancestor is a(n) ________
Fill in the blank(s) with correct word
phylogenetic species
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Which one of the following is absolutely necessary for diffusion to occur?
a. a living cell b. a phospholipid bilayer c. a selectively permeable membrane d. a concentration gradient e. a solution
At the current rate of habitat destruction, what percentage of all living species will be extinct in 50 years?
A) 1% B) 10% C) 25% D) 50%
Which type of fish stores urea in its tissues to keep its body the same osmolarity as the water in which it lives?
A) Tuna B) Shrimp C) Shark D) Goldfish E) Trout
When the body's blood glucose level rises, the pancreas secretes insulin and, as a result, the blood glucose level declines. When the blood glucose level is low, the pancreas secretes glucagon and, as a result, the blood glucose level rises
Such regulation of the blood glucose level is the result of _____. A) catalytic feedback B) positive feedback C) negative feedback D) protein-protein interactions