Earth orbits the Sun because there is a Gravitational pull from the sun on the earth. The earth is pulled toward the sun, rather than going off in a straight line
Gravitational pull from the sun on the earth. The sun pulls the earth in the direction of the Earth’s orbital path
Gravitational push from the sun on the Earth. The sun pushes the Earth away so it does not crash into the sun
Strong magnetic interaction between the sun and the Earth. The gravitational interaction between the sun and the Earth is small

b. examine and describe cells

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.