Answer:
The correct terms for the blanks are - blank1: silica, blank2: chitin, blank3: photoautotrophs, blank4: heterotrophs.
Step-by-step explanation:
Diatoms are photoautotrophic algae, they have a skeleton made up of silica. Diatoms are found in nearly every aquatic environment. They are photosynthesizing algae that make their own food.
Slime molds are heterotropic in nature like protozoa and were formerly classified as fungi but are now placed in protists.
Thus, the correct terms are - blank1: silica, blank2: chitin, blank3: photoautotrophs, blank4: heterotrophs.