Question

Diatoms are planktonic unicellular eukaryotes commonly found in oceans and lakes. They contain chloroplasts that have four membranes. These four membranes are evidence of:___________
a. budding of chloroplasts from the endoplasmic reticulum
b. primary endosymbiosis
c. secondary endosymbiosis
d. evolution from proteobacteria

Answer 1

Diatoms contain chloroplasts that have four membranes. These four membranes are evidence of secondary endosymbiosis (Option c).

What is secondary endosymbiosis?

Secondary endosymbiosis is a hypothesis used to explain why diatom chloroplasts have four membranes.

According to this hypothesis, diatoms received different genes from distinct photosynthetic and non-photosynthetic ancestors.

The acquisition of genes of different ancestors led to diatoms having chloroplasts with four membranes.

Learn more about the endosymbiosis hypothesis here:

brainly.com/question/2957447