What characteristic separates the two kinds of land plants?
a. The thickness and composition of their cell walls
b. The form and shape of their leaves
c. Their root structures
d. The presence of vascular tissue
d. The presence of vascular tissue
The presence of vascular tissue separates the two kinds of land plants.
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One secondary spermatocyte ultimately produces ____ mature sperm
a. one b. two c. three d. four e. eight
Which lymph structure is central to the body's immunity?
a. Thoracic duct b. Bone marrow c. Thymus d. Spleen e. Lymph node
Negative feedback loops act to
a. control sperm production. b. cause uterine contractions during childbirth. c. cause milk production after childbirth. d. cause expulsion of milk during breastfeeding. e. cause an erection of the penis when stimulated.
What is the role of EF-Ts in translation?
What will be an ideal response?