What is a mutation?

A. A permanent change in DNA or RNA

B. A harmful change to an organism's phenotype

C. A damaged protein

D. The visual appearance of an organism

Which of the following could result in secondary succession? a. the formation of a tall sand dune on a previously grassy beach b. a vast glacier in motion forming a U-shaped valley on its wake c.

Describe the events that occur during mitosis

Periodic table below, which elements are predominantly gases with low densities

21. What enables a gene to code for different versions of a trait in different organisms? A. differences in the sequence of alleles on a chromosome B. differences in the sequence of genes on a chromosome C.

What weather system might be occurring if Australia is experiencing droughts and parts of South America are flooded

How do energy conversions make a car go down the street? A. The stored energy of the gasoline is converted to heat, and then to the stored energy of the car. B.

Describe how a flu vaccine the human body?

Adults do not need foods from the dairy group, only growing children and athletes do.

The principle role for sugars in living things is to

Under which condition is competition among fish most likely