Studying for finals

if you decreased a planet's semi-major axis, what effect would that have on it's period?

When species lose their habitats they may..

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

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?