One major strength of science is
a. all theories are correct.
b. all experiments are successful.
c. new ideas are considered as new information comes to light.
d. facts that have been discovered remain unchanged.
e. all questions may be explained by science.
C
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Estuaries in which river flow is strong and prevents the flow of seawater upstream are called:
a. fjords. b. salt-wedge estuaries. c. well-mixed estuaries. d. tectonic estuaries. e. drowned river valleys.
What type of energy is the energy in chemical bonds?
a. solar energy b. activation energy c. kinetic energy d. potential energy e. thermal energy
Which of the following statements about paracrine regulation is true?
a. The hormones released only stimulate the cells that secreted them. b. The hormones released only inhibit the cells that secreted them. c. The hormones released act on nearby target cells. d. The hormones released are transported down axons. e. The hormones released link the endocrine and nervous systems.
What type of species, if removed from the community, could lead to the collapse of the entire community?
A) Endemic species B) Keystone species C) Indicator species D) Flagship species