What are the tissues of a leaf, from the upper surface to the lower surface?
a. epidermis, periderm, epidermis
b. epidermis, palisade mesophyll, spongy mesophyll, epidermis
c. xylem, palisade mesophyll, spongy mesophyll, phloem
d. epidermis, spongy mesophyll, palisade mesophyll, epidermis
e. dermis, spongy mesophyll, palisade mesophyll, dermis
Ans: b. epidermis, palisade mesophyll, spongy mesophyll, epidermis
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A. protons and electrons B. electrons and neutrons C. protons, electrons, and neutrons D. protons and neutrons E. neutrons only
As recently as 2007, researchers found evidence of , that was/were shared by chickens and Tyrannosaurus rex.
A. amino acids in the collagen proteins B. brain structures in the skulls C. gene sequences on chromosomes D. 35 body features E. None of the answer choices is correct.
The ability to maintain an upright position is due to ________ muscle contractions
Fill in the blank(s) with correct word
Each villus contains a lacteal, which functions to:
a. absorb the products of lipid digestion. b. aid in the absorption of carbohydrates. c. aid in the absorption of water. d. secrete enzymes to aid in the absorption of fats. e. remove protein from the interstitial fluid.