All wetlands are considered freshwater ecosystems.

Explain how fossils scientists make discoveries about the lives of organisms and about how environments have changed over time. plz hurry up it time

(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different