Compare the movement of energy and materials through an ecosystem
What will be an ideal response?
Energy "travels" from sun to producers to consumers. Eventually the energy is dissipated from the ecosystem as heat. It is not cycled. Materials on the other hand travel from producers to consumers. Both producers and consumers have waste and eventually die. Through decomposition by bacteria and fungi these materials cycle back to the producers and then to the consumers. Materials cycle through the ecosystem.
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A chemical reaction that has a positive ?G is correctly described as
A. enthalpic.
B. endothermic.
C. spontaneous
D. exothermic.
E. endergonic.
Which of the following occurs during systolic pressure?
a. The ventricles contract. b. The atria contract. c. Both the ventricles and atria contract. d. The heart is at rest.
Typically, one sperm fertilizes an oocyte because ____
a. an acid solution is released that kills all other sperm b. special organelles within the oocyte eject more than one sperm c. changes occur to the oocyte's protein coat that prevent further penetration d. follicle cellular space is only wide enough for one sperm e. usually only one sperm arrives at the oocyte
DNA sequencing data suggest that evolutionary changes are related to an accumulation of:
a. index fossils. b. vestigial organs. c. convergent structures. d. homologous structures. e. changes in DNA nucleotide sequences.