Which group is incorrectly paired with its description?
a. diatoms-important producers in aquatic communities.
b. diplomonads-unicellular eukaryotes with modified mitochondria.
c. apicomplexans- unicellular parasites with intricate life cycles.
d. dinoflagellates-feed on dead organic matter

The correct answer is D. Dinoflagellates-feed on dead organic matter

Explanation:

Dinoflagellates are usually autotroph so they have photosynthetic pigments. When they're heterotrophs they usually are parasites or establish endosymbiotic relationships with algae or others. It's not absolutely impossible that they feed on the dead organic matter but it's not common, while all the other options are completely true for each organism of the groups mentioned.

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

weathering is the answer.