1.Plants have cell walls made up of cellulose which function in the support and protection of the cell.
Animals have only cell membranes made up of phospholipid bilayer and protein which protects and hold together the cell and its parts, it does not need to provide the support that plant cell was provide because animals have other forms of support ( i.e. exoskeletons and endoskeletons) and the lack of the cell wall allows for increased flexibility and advanced cell/tissue specialization, which plants cannot achieve.
Bacterial cell walls are made up of peptidoglycan and provide support for the cells much like plant cell walls.
2.Blood is considered a connective tissue for two basic reasons: (1) embryologically, it has the same origin (mesodermal) as do the otherconnective tissue types and (2) blood connects the body systems together bringing the needed oxygen, nutrients, hormones and other signaling molecules, and removing the wastes.
3.an amber-coloured, protein-rich liquid which separates out when blood coagulates.
5.division of labor is the assignment of different parts of a manufacturing process or task to different people in order to improve efficiency.