LESSON 4.2 Review
Q. KEY QUESTIONS
1. Energy is said to flow in a "one-way” stream
through an ecosystem. In your own words,
describe what that means.

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