Which statement is true? O Gravity can both push and pull objects.
O Only celestial objects exert a gravitational force.
O Only Earth exerts a gravitational force.
All objects with mass exert a gravitational force.

Fossils found in strata reveal that a) innate drive to complexity of life b) unused body parts decrease in size c) older strata carry fossils that differ greatly from living organisms d) geologic changes occur quickly on earth

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.