We think that the presence of ice caps at the poles is the "normal" condition for Earth, but actually this situation is less common than ice-free polar regions. How does continental movement relate to this?
What will be an ideal response?
Ice will form at the poles only in a globally cool world, and it usually forms over a continental landmass. If the continents are distributed in more equatorial realms, the earth will be warmer and there will be no polar ice. Ocean currents transport vast quantities of heat, and when the positions of the continents allow these currents to flow into polar regions, they can prevent the formation of ice caps.
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Which of the following is NOT a way that the skeletal system contributes to homeostasis?
a) Provides support and protection for internal organs. b) Stores and releases sodium ions. c) Houses blood forming tissue. d) Protects the brain and spinal cord. e) Serves as attachment and leverage points for muscles.
The simplest level of CNS function is the
A) spinal reflex. B) ability to talk. C) cerebral reflex. D) ability to work.
Which molecule contains anticodons?
A. An rRNA B. A cDNA C. An mRNA D. A tRNA E. A DNA molecule
What is the cell membrane of a muscle cell called?
A) sarcolemma B) sarcomere C) sarcoplasmic reticulum D) sarcoplasm