Sessile colonial organisms such as bryozoans, hydroids, sponges and tunicates tend to dominate which one of the following habitats:
1.soft-bottom communities
2.hard-bottom communities
2
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Place the following events of parturition in the correct order.
(1) Stretch-sensitive neurons send signals to the hypothalamus. (2) Oxytocin receptors increase in the uterus. (3) Prostaglandin levels increase. (4) Estradiol levels increase. (5) Oxytocin levels increase. (6) Uterine muscles start to contract. A. 1,2,4,5,3,6 B. 4,2,1,5,6,3 C. 5,2,4,1,3,6 D. 1,6,4,2,5,3 E. 4,3,1,2,5,6
In the life cycle of a typical cnidarian, which of the
following is free-swimming? a. medusa b. polyp c. planula d. medusa and planula e. all of these
The adrenal medulla produces
a. mineralocorticoids. b. epinephrine. c. cortisol. d. testosterone. e. glucocorticoids
When a recipient cell acquires a piece of naked DNA from the environment, it is called ________.
A. conjugation B. transfection C. transduction D. transformation