Two species of frogs mate with each other. The embryo dies after a few cell divisions. What kind of reproductive isolation does this example represent?

Empirical evidence is obtained using our human senses, which statement best explains the importance of empirical evidence in science A. This type of evidence is impossible to repeat. o B. This type of evidence is personal and unsupported, o C.

In this illustration, DNA is unzipping to make mRNA during transcription. DNA acts as a blueprint, pairing bases to make single strands of RNA. Identify the pairings you would see when DNA makes RNA.

Which of the following statements is true? Groundwater is not part of the water cycle. Most of the earth's water is freshwater. Refining oil pollutes the air with nitrogen dioxide. Thermal pollution is the main disadvantage of hydroelectric power.

Meiosis is a type of cell division that goes through how many rounds of the 4 mitotic steps A) 1 B) 2 C) 3 D) 4?

What waste product that we then exhale is produced during the kreb cycle?

A limestone rock is found in an Arizona desert. The limestone is gray and has a fish fossil. What can scientists learn from the limestone?

What is the mathematical formula for: An experiment began with 4 cells and ended with 128 cells. How many generations did the cells go through?

What are two ways that crossing over contributes to genetic variation

What would happen if hydrogen bonds form between any two nitrogenous bases in dna

Use the drop-down menus to complete each statement. The___controls land for oil and gas development. The___ensures that federal wildlife laws are followed. The___protects ecosystems and supervises public access to forests.