Cilia beat with two distinctive phases. With the ________ stroke, they stroke like an oar, thereby propelling the organism through the water. With the ________ stroke, cilia bend along their length while they are pulled forward.
Fill in the blank(s) with the appropriate word(s).
effective, recovery
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A neutral solution has a pH of
(a) 3. (b) 5. (c) 7. (d) 9.
Which method of reproduction posed a challenge for clam and oyster fishery workers who thought that cutting predatory sea stars into parts would kill them, but only increased the number of sea stars?
a. Fragmentation b. Fusion c. Budding d. Fission
Which of the following respiratory surfaces lack physical protection from the external environment?
a. internal gills b. lungs c. tracheal system tubes d. external gills
Choose the scientific evidence that supports evolutionary theory. Check all that apply.A) the fossil recordB) homologous structuresC) the molecular recordD) intelligent designE) vestigial structures
What will be an ideal response?