Which objective lens must you always rotate into place, before and after focusing on a specimen

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

Sexual reproduction in the parent cell will result in offspring with a) identical genetic information. b) half the genetic information. c) double the genetic information. d) four times the genetic information.

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight. which of these is most likely effect on the ecosystem?