The answer is OD! Dense water is heavier than less dense water, this will sink because of gravity.
Yes because the key may not be specific enough or when describing a part of it it may be slightly this color but also this color. understand? i can explain more if needed
Insulin(humulin), somatostatin, interleukine, Penicillin etc
Keratinized (containing keratin), stratified (2 or more layers) squamous (flattened) type of epithelium