The main purpose of photosynthesis is to a. produce the food the plant needs to grow. b. convert carbon dioxide gas to oxygen gas. c. absorb sunlight to stop the plant from overheating. d. allow the plant to dispose of excess water.

Which system revise and send electrical signals throughout the body

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.