The sun keeps all of the planets orbiting it because

1.the law of universal gravitation states that an increase in mass causes an increase in gravitational force

2.the law of ellipses states that the planets orbit the sun in circular patterns

3.the law of harmonies states that the motion of the planets will not stop unless an outside force is applied

4.the law of equal areas states that planets sweep equal areas in equal periods of time around the sun

most community's take hundreds of years to become stable

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).