What does the notation Rr mean to geneticists?

heterozygous alleles (My guess)

homozygous alleles

dominant alleles

recessive alleles

During drought years on the Galapagos, small, easily eaten seeds become rare, leaving mostly large, hard-cased seeds that only birds w / large beaks can eat.

Where does the exchange of oxygen, nutrients, and wastes occur?. a. in capillaries. b. in arteries. c. in the lungs. d. in the atria

Which molecule is best described as energy rich because of the amount of energy that can be stored in it and released from it?

An Aluminum soda can is transparent? True? False?

3 ways living creatures use carbohydrates

How does seafloor spreading move plates?

In what ways do humans use diatoms?

How long can a praying mantis live without its head?

All known species can be grouped into three domains. what are they?

Select the correct answer. Which of the following is the correct definition of a biography? OA an account of a fictitious experience that relies on figurative language B. an account of a single significant experience in a person's life C.