What type of relationship exists when a certain type of tree's roots need a fungus present in order to grow normally?

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

Crossing over is a method of (blank)?

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.