Question

no explaination is needed

1. At which developmental stage should one be able to first distinguish a protostome embryo from a deuterostome embryo? a) Fertilization b) Cleavage c) Gastrulation d) Coelom formation Which of the following is a diploblastic phylum of aquatic predators? a) Mollusca b) Annelida c) Arthropoda d) Cnidaria 3. Arthropods are animals with a) a segmented body, hard exoskeleton and jointed appendages. b) a limbless body composed of a series of fused rings. c) soft non-segmented bodies, sometimes protected by a hard shell d) a dorsoventrally-flattened body with no coelom. Which of the following are NOT a major class within the Mollusca? a) Gastropods b) Rotifers c) Cephalopods d) Bivalves Why is the amniotic egg considered an important evolutionary breakthrough? a) It has a shell that increases gas exchange. b) It allows deposition of eggs in a terrestrial environment c) It prolongs embryonic development. d) It provides insulation to conserve heat. 6. A type 11 survivorship curve (with high initial mortality is exhibited by a) humans. b) birds. c) crustaceans. d) oysters. 7. Competition between two species is a) detrimental to both species. b) beneficial to one species and detrimental to the other. c) beneficial to both species. d) beneficial to one species, but the other species is unaffected. PTO

Answer 1

1. (B) clevage

2.(D) Cnidaria

3. (A) a segmented body, hard exoskeleton and jointed appendages

4.(B) Rotifers

5. ( B) it allows deposition of eggs in a terrestrial environment

6. (D) oyster

7. (A) detrimental to both species