Study the cladogram. what does the lizard share with the chimpanzee?
a)
lungs only
b)
claws or nails
c)
lungs and claws or nails
d)
lungs, claws or nails, and opposable thumbs

C). Lungs and claws or nails.

A cladogram is a diagram which is used to depict phylogenetic relationships between organisms belonging to same or different species. A clade can be defined as a group of organism exhibiting common traits similar to the ancestor organism. A cladogram indicates a relationship between organisms with their ancestors. Here, in the given cladogram the characteristics which are common in lizards and chimpanzee are lungs and claws or nails. As, lizard belongs to a group of reptiles and chimpanzee belongs to a group of mammals. Lungs are present in them to support respiration. Claws or nails are present to run and hold surfaces or substrates. For example, climbing on a wall or tree requires claws or nails.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.