Mutations
your

a. randomly occur in organsims
b. occur only if the environment allows
c. happen because of artificial selection
d. are always harmful to the organism

Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

The idea of spontaneous generation was disproved by in a experiment involving jars of meat