What affects the density of an object?

Aseries of connections of food chain in an ecosystem is called a what

Which of the following birds remained ancient looking in the miocene epoch? a. crows b. owls c. grouses d. none of the above

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping