What is a simple way for determining if an annelid is a member of  Errantia (a polychaete) or Sedentaria (a clitellate)?

A. Possession of a closed circulatory system
B. The layout of the digestive system
C. The amount of chaetae (setae)
D. The number of segments


Answer: C

Biology & Microbiology

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Dissolved oxygen content in stream water is affected by

a. organic matter in the water. b. overgrowth of algae. c. water nutrient levels. d. all of the above.

Biology & Microbiology

Which of the following examples would be undergoing secondary succession? Check all that apply.  

_____  an abandoned potato farm _____  a coastal grassland damaged by a hurricane _____  an abandoned landfill _____  rocks in a national park covered by mosses and lichens _____  a garden bed that has been weeded Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about secondary succession? What other information is related to the question?    Choose Answer: Given what you now know, what information is most likely to produce the correct answer?   Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?  

Biology & Microbiology

Leaf abscission is initiated and orchestrated by the hormone abscisic acid

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

Which molecule below does not act as a neurotransmitter and a hormone?

a) thyroid hormone b) glycine c) dopamine d) glutamate e) eicosanoids

Biology & Microbiology