Consider the following planned experiment.
factor
experimental group
control group
amount of water
daily
daily
type of food
fresh grass
fresh grass
vitamins
yes
no
housing
indoors
indoors
which variable is being tested in this experiment?
o
a. amount of water
o
b. type of food
o
c. vitamins
o
d. housing

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

the tricuspid valve is present between right atrium and right ventricle

explanation:

the sun shines white and black light to our planet. the white light has all the colors in it. in our upper atmosphere, we have dust particles and oxygen molecules. the white light meaning all of the colors in a rainbow shines through the upper levels of the atmopshere and the blue light scatters across the entire planet. that is why our sky is blue.