Counting the number of organisms in a small area and multiplying to estimate the number in a larger area is called

a.

direct observation.

b.

mark and recapture.

c.

population density.

d.

sampling.

All chemical reactions occur at the same rate true or false

What is a barred spiral?

X-rays are not part of the electromagnetic spectrum true or false

The fact that electric charges return to the source of the current is an example of:

An electric generator moves a magnet near a coil of wire to produce an electric current. describe the energy transformation in an electric generator. a. it transforms kinetic energy into electrical energy. b.

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction

Where would aliens be if they really do exist here on Earth?

If the mass of an object is 84g and the volume is 12cm3 what is the density

Describe one example of competiton of tropical dry forest