Plant growth substances stimulate root growth from a cut stem. Describe an investigation to find the best concentration of plant growth substance to stimulate root growth.
You should include experimental details in your answer and write in full sentences.

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.

Which level of taxonomy has the fewest organisms?

Identify the area on the image where the force of attraction is the strongest.