Where does the salt in oceans come from?
a)rocks and minerals on land
b)rainfall and snowfall
c)dead plants and animals
d)energy from the sun

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

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.