Which of the following is true about the tree of life?

a. archaea are more closely related to bacteria than they are to eukarya
b. there is no common ancestor of all life forms living today
c. many organisms living today cannot be grouped into one of the three domains
d. two of the three domains of life consist of prokaryotic organisms
e. all prokaryotes and their common ancestor make up a clade

How can you approximate the number of calories required to keep you in energy balance?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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.