Earth has seasons because a. it rotates on its axis. b. the distance between earth and the sun changes. c. its axis is tilted as it moves around the sun. d. the temperature of the sun changes. select the best answer from the choices provided a b c d

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.

If you relate the doppler effect on sound to the color of light waves, a police car would be the color as it approaches and the color as it recedes away from the observer.