Marissa is studying the solar system. which object in the solar system is a star?

A. the sun

B. saturn

C. Earth's moon

D. a comet

Muscle contraction is required for expiration. a. True b. False

Your pollex is___ to your axilla.

Geologic features such as deep river valleys always take thousands of years to form true or false

What three things do all circuits need in order to work?

What causes the inside of the membrane to reverse charge and begin the action potential?

Describe what type of macromolecule lactose is and what the monomer of the macromolecule is

When Santos stands in a swimming pool and looks at his feet, his legs appear to be bent. Which is the term for this phenomenon? A) diffraction B) dispersion C) reflection D) refraction

What triggers pfiesteria change from a harmless algae feeder to a toxin producing fish killer?

Antibodies are made when animals detect a foreign antigen. All mammals carry albumin in their blood. How was a rabbit antibody against albumin created? Was this lethal to the rabbit? Explain you reasoning.

Why are there species instead of a continuum of various animals?