The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the Rocky Mountains were similar in height when they first formed. Which statements about the Rocky Mountains are true? Select the two correct answers.(1 point)They are shorter than the Appalachian Mountains.

They are taller than the Appalachian Mountains.

They are younger than the Appalachian Mountains.

They are older than the Appalachian Mountains.

Which phrase describes the chromosomes by the end of prophase of mitosis? A.
The chromosomes have stretched out.

B.
The chromosomes have separated at the centromere.

C.
The chromosomes are pulled to opposite sides of the cell.

D.
The chromosomes have coiled and become more compact.

What is a positive effect that predators have on a prey population?A.
They keep the prey population low so they will be less likely to deplete resources such as food, water, and shelter.

B.
Predators maintain an unchanged prey population to increase the use of food, water, and shelter.

C.
They eliminate the prey population in order to maintain competition over resources such as food and water.

D.
Prey are able to increase their populations and use of food, shelter, and water when predators are on the hunt.

Justify your choice by explaining why it is a biotic factor. Use complete sentences.

Which statement forms part of cell theory?A.
Cell organelles are capable of reproducing themselves.
B.
Cells differ in shape, but they have identical components.
C.
All cells begin life as prokaryotic cells.
D.
All living things are made up of cells.

Brian lives in a biome that is very similar to a grassland. Trees spot the landscape of this biome. This biome has seasonal rains and stays warm year-round. What kind of biome does Brian most likely live in?

Fats are broken into saturated fats and unsaturated fats. Which of these explains the difference between saturated and unsaturated fats?A) Saturated fats have no hydrogen in the molecule.
B) Saturated fats have more carbon atoms than unsaturated fats.
C) Saturated fats have only single bonds on all the carbon atoms.
D) Saturated fats have only double and triple bonds on the carbon atoms