A fish is observed as having a high and narrow tail. It is an active swimmer and appears to have a very streamlined body. What is the body type of this fish?
a. Fusiform body shape
b. Depressed body shape
c. Globular body shape
d. Laterally compressed body shape
a
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List, in order, the structures in the water-vascular system of a sea star.
What will be an ideal response?
When constructing a YAC, why must a large DNA insert be included?
A) The inserted DNA base pairs with DNA in the genome. B) YACs that are too small do not segregate properly during mitosis. C) The inserted DNA functions as telomeres. D) The inserted DNA contains origins of replication needed for maintenance of the YAC. E) The inserted DNA allows YACs to be used in both eukaryotic and prokaryotic cells.
The brown tree snake in Guam had a of about 100 snakes per hectare, which is approximately equal to two American football fields.
A. population B. death rate C. population density D. growth rate E. population distribution
Bone tissue is hard because its matrix contains
a. collagen. b. iron. c. several minerals. d. calcium salts. e. elastic fibers