Amain function of the leaf petiole is a. to extend the leaf blade away from the stem so the blade can collect sufficient sunlight. b. to keep the leaf away from the secondary meristem of the stem. c. to produce pollen. d. none of the above

During sunny hours, a large amount of build up between the hours of 1: 00-5: 00 pm. a. ozone b. mercury c. lead d. sulfuric acid

What did hunter gathers do to alter the environment?

Which of the following are the ingredients that go into the plant and are needed for photosynthesis? select all that apply. 1.) soil 2.) seeds 3.) carbon dioxide 4.) minerals 5.) glucose (sugar) 6.) water 7.) light energy (sunlight) 8.) oxygen 9.) air