What is represented by a pair of lower case letters such as tt in a punnets square? a. a heterozygous pair of genes b. a pair of recessive genes c. a dihybrid pair of genes d. a pair of dominant genes

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Dan made the table shown to describe two different relationships between animals. organism interactions relationship a relationship b one organism lives inside the organism it feeds off no organism is harmed which of the following statements is most likely correct?

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.