Amphibians are thought to have evolved from
A. ray-finned fish.
B. lobe-finned fish.
C. spiny fish.
D. skates and rays.
E. annelids.
B. lobe-finned fish.
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If a male cat with orange fur produces female offspring with calico fur, what color was the mother cat?
A. orange B. black C. calico D. black or calico E. orange or calico
Enzymes in the body catalyze biochemical reactions and ____
a. are chemically changed at the end of the reaction b. are destroyed at the end of the reaction c. are processed into substrate molecules d. convert substrate molecules into products e. convert products into substrate molecules
________ culture techniques are based on the expansion of the microenvironment to allow abundant growth of a microorganism formerly restricted to a small ecological niche.
Fill in the blank(s) with the appropriate word(s).
A procedure that induces an antibody-mediated response against specific pathogens is called ______
A. exposure B. agglutination C. NK cell activation D. T cell activation E. immunization