What layer of the gastrointestinal wall is a thick layer of connective tissue that provides the gastrointestinal tract with much of its elasticity and distensibility?
a) peritoneum
b) mesentery
c) serosa
d) lamina propria
e) submucosa

Agene with the original sequence of atgtt—tact underwent substitution mutation to form atatt—tact after a few generations. tact is a part of a muscle protein encoding region, and atgtt codes for a digestive enzyme. what will be the effect of this mutation? a. the production of muscle protein will be affected. b. the production of digestive enzymes will be affected. c. the production of both the protein and the enzyme will be affected. d. the production of neither the protein nor the enzyme will be affected.

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.

Aglacier retreats, exposing bare rock and allowing communities of organisms to move in. this is an example of