Two populations of frogs live separated by the amazon river. what experiment could be designed to test whether the two population are one species or two?

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

Why are common names not always useful to biologists?

How circulatory and respiratory system are closely related?