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Some species of present day protists contain living organisms within their cytoplasm. Paramecium bursaria are hosts for zoochlorellae, photosynthetic protists, that live within the cytoplasm of the paramecium. The relationship appears to be symbiotic; the zoochlorellae gain protection and possibly some essential nutrients from the host cytoplasm and the paramecium host has an available food source when its usual food source is depleted.
This symbiotic relationship provides support for the theory of endosymbiosis, which states that

A) animal-like cells evolved from ancestors that were photosynthetic.
B) mitochondria and chloroplasts evolved from small prokaryotes living within larger cells.
C) photosynthetic organisms, like today's land plants, evolved from photosynthetic bacteria.
D) heterotrophic organisms could not have evolved before the evolution of photosynthetic organisms.

Respuesta :

Option B: Mitochondria and chloroplasts evolved from small prokaryotes living within larger cells support the theory of endosymbiosis.

Explanation:

Endosymbiotic theory is based on the theory that eukaryotic cell organelles like mitochondria and plastids like chloroplasts were originally structured as independent free-living prokaryotic cells.

This theory stated that prokaryotic cells were either producing energy through aerobic respiration, or can undergo photosynthesis, or cannot undergo respiration or photosynthesis but just engulf other cells.

These free-living cells ended up staying in host cells through endosymbiosis.

Endosymbiosis is a mutual relationship which is beneficial to both the host and the associated organism.

For example, the relationship between termite and the microbes present in its gut is an endosymbiotic relationship.

Answer:

B. Mitochondria and chloroplasts evolved from small prokaryotes living within larger cells

Explanation:

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