A muscle that has the opposite effect to that of another muscle at the same joint is called a(n)
a. flexor.
b. agonist.
c. depressor.
d. antagonist.
e. extensor.
D
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The movement of carbon from CO2 in the atmosphere to HCO3 - (a byproduct of chemical weathering) on rocks to CaCO3 in coral skeletons and finally CaCO3 in limestone are all steps in the _____________
A. short-term carbon cycle B. nitrogen cycle C. sulfur cycle D. long-term carbon cycle
You have identified a new cytokine associated with the immune system that drastically reduces cell division by lymphoma cells in vivo. Develop a hypothesis and design an experiment to test your hypothesis using a model organism. Include an explanation as to why it is the best model for your experiment.
What will be an ideal response?
Which feature is a unique, derived trait present in all birds?
a. ability to fly b. four-chambered heart c. feathers d. lack of a urinary bladder e. migration
Which structure is a rod of stiffened support
tissue? a. A b. B c. C d. A and B e. none of these