Ahormone attaches to a target cell at a receptor protein. what do you know about this hormone? it is a steroid hormone it is a non-steroid hormone it is able to pass through cell membranes it will enter the nucleus i belive it b

List five ways we are indebted to phytoplankton

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions