Which of the following describes a role of gravity in the formation of our solar system?

i. in the early stages of solar system formation, a fragment of an interstellar cloud of dust and gas collapsed and began rotating under the influence of gravity.
ii. the eight planets were originally orbiting a nearby star, and the sun's gravity pulled those planets into orbit around the sun.
iii. gravity caused small particles in the rotating solar nebula to stick together and form larger particles. this process repeated itself, forming larger and larger particles that eventually became planets.
iv. the combined gravities of the planets pulled the sun away from a nearby star cluster and into the center of the solar system.

a. i, ii, iii, and iv
b. i and iii only
c. i, ii, and iii only
d. i, iii, and iv only

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b.a light particle

Jason puts an apple on top of an ice pack in his lunch bag lunch time the temperature of the apple has decreased what happens to the molecules in the apple when the temperature of the apple decreases