Which of the following statements is accurate?

a. useful energy out of a system is always more than the energy input of that system.

b. energy output of a system is always more than energy put into a system.

c. useful energy out of a system is always less than the energy input of that system.

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Select the correct answer from each drop-down menu proteins are

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons