An asteroid hit the yucatan peninsula about 65 million years ago filling the atmosphere with debris how could this event have contributed to the extinction of dinosaurs

What is the relation ship between structure and function in an organism

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .