Which of the following is a drawback to using biofuels, such as ethanol, as a fuel source?

Bucket of dirt is a mixture of many different particles. Each kind of particle in a bucket of soil has unique properties. Here are four particles that make up soil.

Which internal energy source is the most important in continuing to heat the terrestrial planets today?

What happens to the density of water when it is converted from its liquid state to a solid state

You are caught in severe weather while boating. what should you do?

Beginning with the producer, which represents the correct order in a typical food chain? A) grass-rabbit-fox-mountain lion B) mountain lion-fox-rabbit-grass C) grass-fox-rabbit-mountain lion D) rabbit-fox-mountain lion-grass

If a bird is moving at a velocity of 70 km/h east and a car is moving at a velocity of 80 km/h east, what is the velocity of the bird relative to the passengers in the car? A. 10 km B. 10 km/h C. 10 km/h west D. 70 km/h east

Does bigfoot exist?

An observable trait in a species of frog is controlled by a single gene. The gene has only two alleles, F and f, and F shows complete dominance over f. A predator is introduced into a population of 400 frogs, of which 100 are homozygous recessive.

The area in the brain that plans, anticipates, and controls impulses and is the last part of the brain to mature is the

What event occurs prior to speciation