A bird flies south for the winter and flies back north in the spring.
B.
An amoeba takes in food and digests it.
C.
A cat runs away when it hears a noise.
D.
A person's body increases blood flow to its cold feet.
Answer:
B. A body of igneous rock that forms within Earth's crust
Explanation:
Igneous rocks are of two types: intrusive and extrusive. The extrusive igneous rocks are formed by cooling of lava on the earth surface. The intrusive igneous rocks are formed when the magma cools down within the earth's crust. The intrusive rocks are also called as plutonic rocks. Hence, pluton is a body of an intrusive igneous rock.
a decrease in the number of producers
B.
a decrease in the number of consumers
C.
an increase in the number of producers
D.
an increase in the number of consumers
It would be A. 'a decrese in the number of producers'.