Answer:
b. chloroplast
Explanation:
Chloroplasts are the double membrane-bound organelles that serve as the site for photosynthesis in eukaryotes. Chloroplasts are the organelles where eukaryotic autotrophs synthesize the organic nutrients by the process of photosynthesis. According to the given information, the first eukaryotic cells were heterotrophs as they derived energy by available organic compounds. They did not synthesize the organic nutrients to use them as fuel. Chloroplasts are not present in heterotrophic organisms such as animals. Therefore, chloroplasts are most likely to have appeared last in the eukaryotic cells.
The affinity of hemoglobin for oxygen is less than its structural analog myoglobin. However, this does not affect hemoglobin's usefulness for the body; on the contrary, it allows hemoglobin to be a more efficient carrier than myoglobin. This is because hemoglobin can release oxygen more easily than can myoglobin. It is both important for oxygen to be carried to different areas and also to be released when needed. The higher affinity of a given protein for oxygen, the harder it will be for that protein to release oxygen when needed. Therefore, hemoglobin's lower affinity for oxygen serves it well because it allows hemoglobin to release oxygen more easily in the body.
Answer:
A. Quaternary
Explanation:
We came around Quaternary time frame. This period is called the "Age of Humans"
TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection TheSection
