This picture illustrates what type of selection
1) stabilizing
2) directional
3) disruptive
4) normal

Environmental differences within ecosystems are generally caused by

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Jasmine, at 33 months of age, is able to engage in some self-care behaviors but still has trouble with tasks such as putting on socks. a few months later, she accomplishes this same task relatively easily. the change in abilities is most likely due to