Carbon dioxide would be classified as:

a an element
b a compound
c a heterogeneous mixture
d a solution

The correct answer is option B, that is, a compound.  

A substance, which is formed of two or more different elements is known as a compound. Carbon dioxide refers to a compound, comprising of three molecules that are made up of two elements, chemically combined with each other, that is, one carbon atom and two oxygen atoms. It is a chemical compound generally in the form of a gas.  

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.