Before the ordovician-silurian extinction, the diversity of life on earth was growing enormously due to

a. shallow, warm, continental seas
b. overpopulation of land forests
c. cold, glaciated oceans
d. unknown reasons
e. comets hitting the earth

temperatures get warmer — and heatwaves are more common. nothing says summer like warm weather. this rise in temperatures is caused by the tilt of the earth's axis. our planet doesn't sit perfectly straight as it spins — it has a slight lean of approximately 23.5 degrees with respect to the sun, called the axial tilt.

explanation: