Biologists Think That Endosymbiosis Gave Rise to Mitochondria Before Plastids

Multiple Choice

Biologists think that endosymbiosis gave rise to mitochondria before plastids partly because ________.

A) the products of photosynthesis could not be metabolized without mitochondrial enzymes
B) all eukaryotes have mitochondria (or their remnants) , whereas many eukaryotes do not have plastids
C) mitochondrial DNA is less similar to prokaryotic DNA than is plastid DNA
D) without mitochondrial CO₂ production, photosynthesis could not occur