Explanation:
Each hemoglobin molecule is made up of four heme groups surrounding a globin group, forming a tetrahedral structure. ... There are four iron atoms in each molecule of hemoglobin, which accordingly can bind four atoms of oxygen. Globin consists of two linked pairs of polypeptide chains.
The most simple answer might be hormones. It could be that the person doesn't want to let the other individual down or think less of them.
Answer:
The talk test is used to measure moderate-intensity activities. If a person can talk during an activity, but cannot sing, they are engaged in moderate-intensity activity. If they cannot talk, they are doing a higher-level intensity activity.
Explanation: