Which phrase describes organisms that formed index fossils? are extinct

had soft parts

were generally large

lived in a narrow geographic area

Which of the following is not a characteristic of carnosaurs? a. long narrow skulls b. strong forelimbs c. horn projecting from their skulls d. none of the above

When is your breathing likely to speed up? a. when your white blood cells increase b. when your cells need more energy c. when your heart cells need more carbon dioxide d. when your blood cells have too much oxygen

For mendels studies, why was it important that his subjects, pea plants, could reproduce quickly and and produce many offspring?