In 1938, scientists found a population of coelacanths in the Indian Ocean. This fish species is considered a "living fossil" and appears not to have changed morphologically for 80 million years. This discovery supports the ________ model of evolution.
A. punctuated equilibrium
B. common descent
C. gradualism
D. natural selection
E. adaptation
Answer: A
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The plasma membrane of a muscle fiber is called the sarcolemma
____________________ Indicate whether the statement is true or false.
Water molecules can form hydrogen bonds with _____
A) compounds that have polar covalent bonds B) oils C) oxygen gas (O2 ) molecules D) chloride ions
Coral obtains energy
A. by capturing and digesting small animals and through symbiosis with photosynthetic algae. B. by performing photosynthesis and capturing and digesting small animals. C. by capturing and digesting small animals. D. through symbiosis with photosynthetic algae.
The oldest fossils of eukaryotic cells are about ________ years old.
A. 1.8 billion B. 3.5 billion C. 500 million D. 100 million