Were you able to observe the nucleolus in any of the cells? if so, which ones? use complete sentences.

See the answer below please.

Explanation:

The nucleolus corresponds to a structure present in the nucleus of the cells, where the ribosomal RNA required for the assembly of ribosome units for protein synthesis is synthesized. In mammals 1-5 nucleoli can be observed, they can be observed grouping in the interphase period (phases G1, G2 and S of the cell cycle).

The nucleolus has a spherical shape, is found in all eukaryotic cells (exception: sperm) and is surrounded by dense chromatin.

The nucleolus in any cell is visible inside the nucleus.  

Explanation:  

Every cell except the mature red blood corpuscles (RBC) have a nucleus in the cytoplasm of the cell. Nucleus is a membrane bound organelle which surrounds the genetic material of the cell of the organism. Nucleolus is the  the synthesis site for ribosomal RNA or rRNA and signal recognition protein (SNPs). The DNA sequence in chromosome which is responsible for the synthesis of rRNA forms the nuclear organizing regions which results in a dense group of proteins, DNA and RNA molecules inside the nucleus.

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