Consider the Following Points: (A) All Excavates Live in Environments

Consider the following points: (a) All excavates live in environments where oxygen availability is low; (b) all excavates lack mitochondria; and (c) all excavates have some mitochondrial genes. Based on this information, which of the following statements is TRUE of the excavate lineage?

A) Their ancestors were eukaryotes that existed prior to the origin of mitochondria.
B) Their ancestors had mitochondria, but the mitochondria were lost over time.
C) Their ancestors were not able to metabolize glucose.
D) Excavates are in the process of acquiring mitochondria through evolutionary adaptation.

Correct Answer:

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