Most simple invertebrates obtain their oxygen by diffusion directly from the surrounding

WATER

Explanation:

The options attached to this question are given below:

A. Mud.

B. Water.

C. Blood.

D. Air.

Generally, simple invertebrate organisms have simple body structures, which allow exchange of gases to occur through the process of diffusion. Diffusion is a process by which substances are transported from the region of higher concentration to the region of lower concentration. Most simple invertebrates lives in water and they obtain the oxygen they need for survival through the process of diffusion; the oxygen gas diffuse into their body system and the carbon dioxide is also eliminated through the same process.

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the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.