What effects do keystone specie shave on an ecosystem?

A. They make prey species extinct

B. They reproduce biodiversity

C. They keep populations of species balanced

D. They cause primary disturbances.

Which statement describes many of the structures involved in the first line of defense of the immune system?

What is the layer of the sun from wich energy is produced?

Junction between a motor neuron and a skeletal muscle fiber 1) sarcoplasmic reticulum 2) junction 3) motor end plate 4) axon terminal

What are the 3 types of fronts? Cold, warm, and what?

Use this factor to calculate your protein needs based upon weight in kilograms. 1. 0.8 grams/kilogram 2. 1.2 grams/kilograms 3. 4.0 grams/kilograms a

Which describes the notation Tt for being the trait of being tall

Why would a lab technician choose a bacterial artificial chromosome for cloning a gene rather than a plasmid?

Vertebrates have a notochord during early embryonic development. True False

In the Earth's mantle, heat is transferred in large convection currents. Within these currents, A. hotter and cooler rock sink but do not rise. B. cooler rock rises and hotter rock sinks. C. cooler and hotter rock rise but do not sink. D.

Name two findings that have emerged from experiments done in space iss