In sponges, the choanocytes or collar cells
a. are found scattered throughout the sponge body.
b. act in obtaining food for the sponge.
c. allow exit of water from the sponge.
d. produce spicules made of silica or calcium carbonate.
e. give rise to gametes.
B
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The poison warfarin was once the most popular form of rat control. Eventually warfarin-resistant rat populations emerged so people stopped using warfarin for rat control. Since then, the frequency of warfarin-resistant rats has once again declined. What may be the reason for this?
What will be an ideal response?
Which density-dependent factor controls the size of a population?
a. wind velocity b. light intensity c. nutrient supply d. rainfall e. wave action in an intertidal zone
What do tarsiers and giant squids have in common?
a. They are both active during daytime as well as at night. b. They both live in water. c. They are both active during daytime. d. They are both nocturnal.
The use of heat lessens the amount of time needed to disinfect or sterilize medical instruments
Indicate whether the statement is true or false