Where does the water in streams and rivers originate? a. precipitation b. runoff c. ice and snowpacks d. all of the above

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

What does the positioning of transcription factors determine?

One brief stimulus of a skeletal muscle may result in a single isolated contractile event, which is called a twitch. one twitch can generate max tension in a muscle. are these statements true or false?