Which of the following distinguishes how auxins affect plant stems? Auxins enable plant stems to search for water.

Auxins give plant stems their strength and rigidity.

Auxins enable plant stems to reach for sunlight.

Auxins give plant stems their green pigmentation.

Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. what could he have done to increase the validity of his data? reduce the number of plants. remove the 1 hour group. add a 0 hours control. measure the oxygen in liters

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?