Often on a topographic map, every fifth contour line is darkened. what is thisline called? оа) keyob) slopeoc) benchmarkod) index countour

How do adaptation affect a species?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Which of these best describes what occurs during cytokinesis? a) the chromosomes are separated b) the cell begins to divide by replicating the chromosomes c) the cytoplasm is divided between the two new daughter cells d) the nucleus opens to allow the chromosomes to enter the cytoplasm