What observation led researchers to propose that chloroplasts evolved from cyanobacteria? a) both produce proteins. b) both contain mitochondria. c) both provide structure to cells. d) both perform photosynthesis.

D) Both Perform Photosynthesis

Chloroplast are specialized structures in plant and algal cells. The main function of the chloroplast is to perform photosynthesis by capturing the sunlight with the help chlorophyll pigments and convert it into energy storage molecules called as ATP.

Cyanobacteria are known to be the ancestor of chloroplast, the are also known as blue green algae because of the presence of photosynthetic pigments in it.

Although, Cyanobacteria comes under bacteria but they are capable of trapping the sunlight and produce energy. That shows ancestral relationship between chloroplast and cyanobacteria.

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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: d

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: d

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).