If light strikes a photopigment, the photoreceptor cell will decrease the amount of ________ it is releasing
Fill in the blank(s) with correct word
neurotransmitter
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The Arctic has been a key research area for the study of predator/prey dynamics in the community because:
A. there are more predator/prey examples in the Artic. B. the Arctic has only one species of predator. C. Arctic communities are generally smaller in size. D. there is a greater number of species in the Arctic. E. predator/prey interactions work differently in the Arctic than in other types of habitats.
A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?
A. 0 B. 5 C. 7 D. 9 E. 14
Which protist group typically consists of amoeboid cells surrounded by a hard outer shell through which cytoplasmic
projections extend? a. rhizarians b. unikonts c. euglenoids d. archaeplastids e. opisthokonts
Which of the following describes spicules?
a. They are complicated pore openings and passageways found in sponges. b. They are fibrous skeletal proteins found in sponges. c. They are needlelike skeletal structures made up of silica or calcium carbonate found in sponges. d. They are specialized digestive cells found in sponges.