Which of the following best describes a virus?

A. amino acids surrounded by chitin

B. DNA surrounded by RNA

C. a prokaryotic unicellular organism

D. nucleic acids surrounded by a protein coat

Why isn't pluto considered a planet anymore?

How much energy is passed from one trophic level to the next

Which waves move by replacing one particle with another

A 0.50 kg ball that is traveling at 9.0 m/s collides head-on with a 1.00 kg ball moving in the opposite direction at a speed of 11.0 m/s. The 0.50 kg ball bounces backward at 15.0 m/s after the collision.

Which of the following changes occurs naturally in a system over time?

What's earths most precious element?

An example of forced convection is the movement of hot air by a fan. true or false?

An object has a kinetic energy of 233 J and a momentum of magnitude 20.4 kg·m/s. Find the speed and the mass of the object.

What is the average velocity of atoms in 1.00 mol of neon (a monatomic gas) at 465 K? For m, use 0.0202 kg.

What type of visible light spectrum does the sun produce?