A dairy farmer wanted to increase the amount of milk produced by his cows. He decides to test the effect of a particular feed additive. He give half of his herd
the additive. He maintains the amount of grazing time, the amount of water the
cows drink per day, and even how often the cow gets chased by the local dog
was the same for all the cows. Each day the farmer milks the cows at the same
time and compares the volume of milk. What is the independent variable?

I think the Independent variable is the amount of feed additive that the farmer gives to his cows.

Explanation:

the bald eagle got 50 because everything gets 10% of what they consume and since 50 is ten % of 500 hundred that means the   grasshopper had to have consumed a plant with 5,000 calories of energy

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation