Protists that have a pellicle are surrounded by
silica dioxide
calcium carbonate
carbohydrates
proteins

proteins

Explanation:

Protists are unicellular eukaryotic organisms. As eukaryotes, they carry an individualized, delimited nucleus and well-defined cytoplasmic organelles. The Protista kingdom is made up of protozoa and certain unicellular algae. Among the protists that have a pellicle, such as Euglena, there is the presence of protein film organized spirally around the cytoplasm. This film is very flexible and allows the constant change of the shape of these organisms. These organisms are found in freshwater puddles with a lot of organic matter and are considered bioindicators of pollution in this kind of environment.

b - the respond is innate and varies over time.

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the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.