Divers instinctively prevent serious damage to arms and legs by pulling them in close to the body during a dive. which two organ systems work together to accomplish this?
a. muscular and digestive systems
b. circulatory and nervous systems
c. nervous and muscular systems
d. digestive and circulatory systems

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

How does secondary succession differ from primary succession?