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

Biology & Microbiology

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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

Biology & Microbiology

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%

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology