Although amphibious frogs live on land and in water, they must lay their eggs in water or the eggs will dry up, effectively killing the offspring inside.<span> Frog eggs are covered with a glycoprotein, which helps keep the eggs moist. This glycoprotein has to keep in contact with a source of moisture, such as water.</span>
Answer:
this study is clearly an observational work
Explanation:
experimental studies involve to establish direct associations between a traits and its phenotypic effects. For example, a classical experimental study would involve to map a nonsense mutation in the ACTN3 gene significantly correlated to the non-sprinting phenotype
To determine visually the pH(acidity of basicity) of the solution.
There are four classes of macromolecules (polysaccharides or carbohydrates, triglycerides or lipids, polypeptides or proteins, and nucleic acids such as DNA & RNA). Carbohydrates and lipids are made of only carbon, hydrogen, and oxygen (CHO). Proteins are made of carbon, hydrogen, oxygen, and nitrogen (CHON). Hope this somewhat helps!
( I'll put the rest in below )
