Which best explains the circulation system within mammals?
a. mammals use a closed, single-loop circulatory system aided by a three-chambered heart.
b. mammals use a closed, single-loop circulatory system aided by a four-chambered heart.
c. mammals use a closed, double-loop circulatory system aided by a four-chambered heart.
d. mammals use an open, double-loop circulatory system aided by a four-chambered heart.

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

What is the difference between sex-linked traits and autosomal traits in humans? a. sex-linked traits can only be passed from fathers to sons, while autosomal traits can be passed on from both parents to offspring of any sex. b. sex-linked traits are passed on through the x and y chromosomes, while autosomal traits are passed on through the other 22 chromosomes. c. sex-linked traits only affect females, while autosomal traits affect both males and females. d. sex-linked traits refer to genes that are on the x and y chromosomes, while autosomal traits refer to genes on all 23 chromosomes.