Which term describes foreign molecules that activate the immune system?

Which characteristic is directly related to a planet's average distance from the Sun?

Experiment: Water Properties: Why were the results with just water so much different than the trials with the detergent?

1. what is a word for give up

What are the different proteins used in the Plasma Membrane?

In which direction does Earth rotate? eastward around its axis in an ellipse around the Sun counterclockwise around the Sun from north to south around its axis What force acts between Earth and the moon? gravity mass motion newtons

Aquaporins are proteins that control the passage of water molecules across a cell membrane. The protein forms a pore, or opening, in the membrane.

I have moist skin but no scales, and two pairs of legs. Although I have lungs and live on land, my young usually live in water and use gills to breathe.

Why is wind, like force, considered a vector quantity?

When did darwin arrive on the galapagos islands

A cell has 36 chromosomes. After it divides by mitosis, how many chromosomes will be in each cell?