Consider the Following Points

question 26

Multiple Choice

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.

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