Answer:
Due to presence at early days of the planet.
Explanation:
We only find the remains of single celled organisms in the oldest fossils because the single celled organisms are the organisms that were present in the early days of this planet. These single celled microbes were present about 3.7 billion years ago while on the other hand, the oldest rocks are only a little older i. e. 3.8 billion years so these single celled organisms are considered as oldest fossils on this planet.
Answer: Option C) ribosomes
Explanation:
Ribosomes are small round bodies attached to the endoplasmic reticulum (rough endoplasmic reticulum) in the cytoplasm of cells. They serves as site for protein synthesis due to the presence of ribosomal RNA, rRNA in them.
Thus, cells that are in active protein
synthesis are filled with ribosomes.
Answer:
Nucleotides
Explanation:
I may have searched it up, heh.