Question

are unicellular microalgae with cell walls made up of silica.
diatoms
spores
angiosperms
dinoflagellates
are eukaryotic, simple, photosynthetic organisms.
chlorophyll
mangroves
angiosperms
algae

Explanation:

• First question: Diatoms are unicellular microalgae with cell walls made of silica. Spores are reproductive structures. Angiosperms are flowering plants. Dinoflagellates have cell walls made of cellulose.
• Second question: Algae are eukaryotic, simple, photosynthetic organisms. Chlorophyll is a pigment. Mangroves are plants. Angiosperms are complex plants.

Answer:

• First question: Diatoms
• Second question: Algae