Answer:
What is obtained by putting a bunch of muscle cells together is muscle tissue (option c).
Step-by-step explanation:
Cells are the basic units that constitute living beings. These cells have the ability to differentiate and associate to form tissues.
Muscle cells are specialized cells, with contractile capacity, which when united form the muscular tissue, from which the striated and smooth musculature of the internal organs is formed.
Cells form tissues, these form organs and the set of organs constitute the different apparatuses and systems of the organism.
The other options are not correct because:
- Heart : is a specialized organ formed from heart muscle tissue.
- Circulatory system: is a set of organs and structures, responsible for the circulation of blood. It includes the heart and blood vessels.
- Molecule: corresponds to the molecular level of matter, formed from the association of atoms.