Which of the following do chordates have at some point in their lives? a. notochord b. pharyngeal gill pouches c. nerve cord d. all of the above

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

What maintain homeostasis when a persons internal body temperature is 97.5°f

Aplant may open end close its stomata to prevent excess water loss and maintain