If we looked at the fossil record, which type of plant would have the oldest fossil? A. angiosperms
B. gymnosperms
C. mosses
D. conifers

Explanation:

Cyanobacteria

Cyanobacteria: Fossil Record

The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. This may be somewhat surprising, since the oldest rocks are only a little older: 3.8 billion years old!

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.

b. the carbon cycle ensures living things have a source of hydrogen