Which is considered to be a scientific theory? a) how gravity works b) the fact that gravity exists c) the fact that gravity is necessary d) the idea that gravity is part of physical science

The correct answer is A. How gravity works

Explanation:

The word "theory" is a term that emerged in Ancient Greece where it was used to refer to the action of observing, contemplating or studying. However, nowadays, theory refers to a set of statements that explain a phenomenon. Indeed, a scientific theory is a proved explanation that describes how and why a phenomenon occurs that emerges from multiple and consistent experiments and observations. According to this, "How gravity works" is the option that describes a scientific theory because this focuses on explaining the way and reasons a phenomenon occurs which is the purpose of scientific theories.

a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands