Placoid scales are found on:
a. lungfish.
b. sharks.
c. ray-finned fish.
d. lob-finned.
e. snakes.
B
You might also like to view...
A microbiologist obtained two pure isolated biological samples: one of a virus, and one of a viroid. The labels came off during a move from one lab to the next, however
The scientist felt she could distinguish between the two samples by analyzing for the presence of a single type of molecule. What type of molecule would she be looking for to differentiate between the two? A. DNA B. Protein C. Lipids D. RNA
The genetic code is made up of codons consisting of
how many nucleotides? a. 2 b. 3 c. 5 d. 6 e. 9
During exercise, the skeletal muscles receive
__________ blood, the brain receives __________ blood, and the gut receives __________ blood than at rest. a. more; the same amount of; less b. more; less; less c. the same amount of; the same amount of; less d. the same amount of; the same amount of; more e. less; more; less
The main components of soil are
A. air and water. B. a mixture of soil particles of different sizes. C. both living organisms and decaying organic material. D. All of these are components that define soil.