Answer: The answer is C. An iron atom located on the heme portion hemoglobin
Explanation: Hemoglobin is responsible for the transportation of oxygen in the red blood cells to tissues of vertebrates. It is the protein molecule found in the red blood cells.
Hemoglobin is made up of 4 heme molecules surrounding the globin group, forming a tetrahedral structure. The heme molecules contain one atom of iron each and this is the binding spot for each molecule of oxygen through a covalent bond. Therefore, each hemoglobin molecule can have up to four molecules of oxygen attached to them.
Answer:
Option B, Mechanical Isolation
Explanation:
Mechanical isolation is a phenomena which prevent species from mating each other.
In mechanical isolation, species have different physical structure due to which they are unable to interbreed.
For example - In snails, two certain species are unable to mate as the shell of one is coiled in the same direction as that of shell of other. Hence, two right coiled snails cannot breed with each other. The same applies to the left side tailed species.
Hence, option B is correct
Bears and bald eagles both eat fish,so they compete for food