A horizontal branch in an evolutionary tree indicates

A. gradualism.
B. punctuated equilibrium.
C. extinction.
D. convergent evolution.
E. temporal isolation


B. punctuated equilibrium.

Biology & Microbiology

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An action potential begins when

a. sodium channels open. b. potassium channels open. c. both sodium and potassium channels open. d. sodium channels close. e. both sodium and potassium channels close

Biology & Microbiology

Which of the following is NOT a primary catabolic source of energy to produce ATP?

fatty acids cholesterol amino acids Glucose

Biology & Microbiology

What is the ratio of phenotypes in the offspring produced by the cross Aa × Aa? Assume complete dominance for the trait

A) 75% dominant:25% recessive B) 50% dominant:50% recessive C) 25% dominant:75% recessive D) 100% dominance E) 100% recessive

Biology & Microbiology

Select the following phylum that includes animals that are unsegmented, acoelomate, and have a digestive cavity with a single opening.

A. Platyhelminthes B. Annelida C. Cnidaria D. Nematoda E. Rotifera

Biology & Microbiology