Insulin and growth hormones are both steroid hormones.
a. true
b. false

False

Explanation:

On the basis of their chemical composition, hormones are classified into two broad categories: lipid-soluble and water-soluble hormones. The water-soluble hormones include amine hormones, proteins, and peptide hormones and eicosanoid hormones.

Steroids hormones are lipid-soluble hormones. Examples of steroid hormones include aldosterone, cortisol, etc.  

The hormones that are made of more than 50 amino acids are categorized as protein hormones. These hormones generally have 50-200 amino acids in their chemical structure. Both growth hormone and insulin are the protein hormones.  

For example, insulin hormone consists of peptide chains A and B with 21 and 30 amino acids respectively. The peptide chains are joined together by disulfide bonds. Likewise, the growth hormone is made of as many as 191 amino acids.  

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."