Answer:
The answre is B Echinodermata
Explanation:
Sea cucumber, (class Holothuroidea), any of 1,200 species of marine invertebrates that constitute a class within the phylum Echinodermata.
Butterflies have different breeds just like how humans have difference race, also can reproduce.
the difference is that butterfly have wings and humans don't. <span />
IV:The detergents
DV: the dishes
Hypothesis: The expensive dish detergent cleans better then cheaper detergent
Control: the amount of detergent used
Contants: the detergents
The four levels of protein structure are distinguished from one another by the degree of complexity in the polypeptide chain. A single protein molecule may contain one or more of the protein structure types: primary, secondary, tertiary, and quaternary structure. 1. Primary Structure: describes the unique order in which amino acids are linked together to form a protein.
2. Secondary Structure: refers to the coiling or folding of a polypeptide chain that gives the protein its 3-D shape. There are two types of secondary structures observed in proteins. One type is the alpha (α) helix structure. This structure resembles a coiled spring and is secured by hydrogen bonding in the polypeptide chain. The second type of secondary structure in proteins is the beta (β) pleated sheet. This structure appears to be folded or pleated and is held together by hydrogen bonding between polypeptide units of the folded chain that lie adjacent to one another
3. Tertiary Structure: refers to the comprehensive 3-D structure of the polypeptide chain of a protein.
4. Quaternary Structure: is the structure of a protein macromolecule formed by interactions between multiple polypeptide chains. Each polypeptide chain is referred to as a subunit. Proteins with quaternary structure may consist of more than one of the same type of protein subunit.
Answer:
The correct answer would be D) cardiovascular system.
The cardiovascular system of the body consists of pumping organ that is, heart, blood vessels (arteries, veins, and capillaries), and transporting medium which is blood.
It is the main system which helps in transportation of oxygen, nutrients, and hormones throughout the body. In addition, it helps in the removal of metabolic wastes such as carbon dioxide and nitrogenous wastes.