Read the sentence from "Black Hole Beginnings."
Under the force of its own weight, the gigantic ball presses
inward
What question should readers ask to determine the cause
in the sentence?
How much does the ball weigh?
Why does the ball press inward?
What does the weight of the ball do?
How does the ball produce force?

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

How can you tell the difference between rough er from smooth er?

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers