How do scientists calculate population density?

Which part of the root contains transport tubes?

What is one of the main problems with being able to predict when a volcanic eruption will occur? A) Adequate equipment & technology B) Not enough trained scientists C) Equipment and scientists' time is very expensive D) No warning signs

Darwin discovered that the same species of organisms had different traits from one island to the next. According to Darwin, this happened because the organism had

What will happen when a blood cell is placed in a hypertonic salt solution?

In this food chain energy moves from one living thing to another. What source of energy starts this food chain?

Scientific notation for 0.000468

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