Which best describes somatic mutations? -They are usually passed on to offspring. -They can cause different kinds of cancer. -They always result from point mutations. -They only occur in reproductive cells.

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Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b. passive c. facilitated d. active b. passive

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?