Roberta made a chart of rocks and minerals. which of these can be placed in the column labeled minerals? a) can contain a fossil b) made of just one substance c) made of at least two substances d) can be made of tiny grains of sand

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Which of these correctly describes the difference between processes that take place in prokaryotic and eukaryotic cells?

Where does the esophagus lead to in a frog?