The si temperature scale used in science is the

Using meiosis, the sporophyte produces spores that are .

Why should organisms reproduce more offspring than will survive? select all that apply.

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?