What are the two processes that create genetic variation in living things over time?

5. Which of the following statements best explains the role of meiosis in reproduction? Meiosis allows chromosomes to exchange genetic material through crossing over. Meiosis makes it possible for a zygote to have the correct number of chromosomes.

Where does subduction occur? A. along the middle of some ocean floors B. down the middle of mountain ranges C. on continents D. at deep-ocean treanches

A fruit fly has four chromosomes. The zygote formed by the sperm and the egg of fruit flies will have chromosomes.

What time is it in Montana right now.

Which word is correctly used in blank #2? There __1__ two apartments for sale in this building which ___2___ going to look at if we can only remember ___3___ they're located. A. where B. were C. we're

Gregory Mendel's work was in the area of ... ? A) DNA B) RNA C) Inheritance D) Reproduction

Use Models Use a separate piece of paper draw a Punnett square to represent the cross of two pea plants, each heterozygous for tallness (Tt). Use the Punnett square to identify the probability of an offspring that is short.

What factor most influences the power pf a stream to erode and transport material?

Match each step of the scientific method with its description

Several instances of irregular digestion are listed in the table below. Condition Description Symptoms Heartburn Inability of the muscles at the end of the esophagus to close Burning sensation in throat Peptic ulcers An open wound in the lining of