Tiffany was investigating how fast it took Hayden to react to different sounds. Independent variable: Different sounds.
Dependent variable: How. fast Hayden reacted.

Identify at least 2 variables that Tiffany should keep constant in this experiment?

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.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Amniocentesis is a process in which amniotic fluid is taken from the mother's womb to identify any genetic abnormalities in the fetus. how would the discovery of the human genome contribute to this process?