Biological scientists use a variety of methods to gather evidence, or data. if a biologist gathers different species of snakes from a tropical region, what type of investigation did the biologist perform?
a laboratory experiment
b observational field study
c model-building
d collection of specimens

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Amoeba sisters video recap pedigrees