Explanation

The nucleus is the control center of the cell, regulating all cellular activities, including growth and reproduction.

It contains the cell’s genetic material (DNA).

Explanation

Red blood cells (RBCs) are primarily responsible for transporting oxygen from the lungs to various tissues in the body.

They contain a protein called hemoglobin, which binds to oxygen molecules, facilitating their transport.

Explanation

Group O can donate red blood cells to anybody.

It's the universal donor.

Group kind O negative blood is occasionally called the generic blood donor type.

Only 7% of the population is O negative.

 ND23-4-2023

Explanation

Amoeba, Euglena, and Paramecium are all unicellular organisms.

They consist of a single cell that performs all the functions necessary for survival, such as movement, reproduction, and obtaining nutrients.

Explanation

The nucleus is the most important part of the cell as it controls all the activities of the cell, including growth, metabolism, and reproduction.

It contains the cell's genetic material (DNA) which regulates gene expression and directs protein synthesis.