Animals covered by eight overlapping shells on their dorsal surface are
a. chitons.
b. octopuses.
c. shrimp.
d. crabs.
e. lobsters.
A
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Most of the nutrient digestion and absorption takes place in the ____
a. stomach b. duodenum c. jejunum d. ileum e. large intestines
Prokaryotic cells are smaller than eukaryotic cells. What is a plausible explanation?
A. Prokaryotic cell walls limit their cell growth. B. Eukaryotes are immobile, allowing them to grow larger. C. Prokaryotes lack the genetic material needed for protein synthesis. D. Eukaryotes have compartmentalization, which allows for specialization. E. Prokaryotes have more diverse energy sources.
Which of the following groups include organisms that are a key source of food in all aquatic environments and whose fossilized forms are used as a filter and as a grinding and polishing agent?
A) diatoms B) brown algae C) amoebas D) dinoflagellates
Which wastewater treatment process produces BOD-containing effluent used for irrigation?
A) anaerobic sludge digestion B) primary sewage treatment C) secondary sewage treatment D) tertiary sewage treatment E) water treatment