Which phrases describe radioactive elements? check all that apply.
a-occur in nature
b-decay at a constant rate
c-have a consistent number of particles
d-have a half-life that determines their rate of decay
e-release energy and particles to maintain radioactivity

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

What is the difference between a scientific hypotheses and a scientific theory?

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament