Genotype and the environment both can affect a phenotype. Phenotype= a physical feature resulting from a certain genotype.
For example, let's say a person born with a genotype pp has the phenotype: pale skin. However, if they live in a sunny environment, then the melanin in their skin will increase over time changing their phenotype to tan skin. Does that make sense as to how both factors can impact phenotype?
Water molds are the protists which get nutrients mainly by absorbing molecules from other organisms through their cell walls and cell membranes.
These organisms are absorptive in nature and they obtain nutrition either through dead and decaying matter or by living off as parasites on other organisms such as plants and fishes.
These organisms have filamentous growth because of which they were thought to be fungi however their cell wall is made up of the cellulose and, not chitin and thus they can be differentiated from fungus.