How is modern Earth different from Earth over four billion years ago? Constantly bombarded with comets and asteroids
Little to no oxygen
High levels of ultraviolet radiation
Protective atmosphere

This is a type pf behavior that animals are born with and them to survive

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

The activity of the modern sample is 1.10 bq . how long does that measurement take?