An anterior pituitary gland
Explanation: this experiment is long term which means patience is compulsory. you need to have a wild sloth and a domesticated sloth adopted right at their birth (he should be in a controlled environment that mimics the wild). your domesticated sloth shouldn't have the algae. at their middle age, you should compare them with them from every aspect.
Density is measured in mass per volume thus C would be the answer.
2.17 g / cm³
1,700 species of plants live on the arcitc like flowering plants , herbs , grasses,dwarf shrubs, mosses , lichens and the arctic willow ....
