What actually begins the uterine contractions which leads to giving birth?
A. oxytocin
B. prolactin
C. estrogen
D. prostaglandins
E. the movement of the fetus
D. prostaglandins
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Which of the following statements is NOT true of lophophorates?
A. Their tentacles serve both in respiration and in feeding. B. They have a U-shaped digestive tract. C. They have a true coelom. D. There are three phyla of them: Phoronida, Bryozoa, Brachiopoda. E. They are parthenogenetic.
The ____ hypothesis states that mitochondria and chloroplasts evolved from bacteria
a. invagination b. exosymbiont c. membrane folding d. captured bacteria e. endosymbiont
Of the following characteristics, which apply to a planktonic organism that photosynthesizes? Choose all that apply.
What will be an ideal response?
Which statement about plant hormones is true?
A) Plant hormones are produced in very small concentrations. B) Plant hormones mainly affect reproductive processes. C) A hormone typically has a single, specific effect on all cells. D) Plant hormones play a vital role in photosynthesis.