Into the 1980s, computers were still using punch cards for programs. A common trick was determine the correct order (in case they ever fell or became disorganized)
or drawing a diagonal line on the side of the stack to
O lining
O marking
O naming
O numbering
O striping

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?