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.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.