What is needed for natural selection to occur? select all that apply.

a. variation in traits
b. several interbreeding populations
c. differential reproduction
d. some form of predation or disease
e. traits that can be passed from parent to offspring.

What must be true for natural selection to heppen

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.) chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

What is the most appropriate method of gaining weight (muscle mass)