Which of the following structures within the chloroplast absorb light energy for photosynthesis? A. Photosystems I and II, predominantly photosystem I
B. Thylakoids, predominantly grana
C. Photosystems I and II, predominantly photosystem II
D. Chlorophyll, predominantly chlorophyll a

Look at the photo of the leaf. which term best describes this leaf?

Variety of living organisms; includes genetic, species, and ecological types.

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.