What transport process can create a concentration gradient for sodium across the plasma membrane?.

Me with biology endocrine system crossword also image left i need with hw

2points what do bacteria have in common with the cells of other living organisms?

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?