Question

Researchers determine the population of phytoplankton in an area of the ocean is significantly decreased compared to the previous year. What can they conclude from this observation?(1 point)
Responses

The plankton as a carbon sink and as a carbon source in the area will be less than expected.
The plankton as a carbon sink and as a carbon source in the area will be less than expected.
The plankton as a carbon sink will be greater than expected, but the plankton as a carbon source will be less than expected.
The plankton as a carbon sink will be greater than expected, but the plankton as a carbon source will be less than expected.
The plankton as a carbon sink and as a carbon source in the area will be greater than expected.
The plankton as a carbon sink and as a carbon source in the area will be greater than expected.
The plankton as a carbon sink will be less than expected, but the plankton as a carbon source will be greater than expected.

Answer 1

From the observation that the population of phytoplankton in the area of the ocean has significantly decreased compared to the previous year, researchers can conclude:

**The plankton as a carbon sink will be less than expected, but the plankton as a carbon source will be greater than expected.**

This is because a decrease in phytoplankton population means less carbon dioxide is being fixed through photosynthesis (carbon sink), while the decomposition of phytoplankton could release more carbon dioxide back into the water (carbon source) than the amount being absorbed.