Name 2 of the 4 ways diseases can be spread by a communicable disease.

Explanation:

Diseases which spread with communicable are often require exchanged fluid, low quality hygiene, air which is breathed by that person etc.These are often caused by pathogens or germs . Diseases can spread from one animal to another. Ho_o sapiens sapiens(humans) being animals, they may get effected from these too. Examples are;

Ebola(West African)

Zika(caused by mosquitoes)

Chicken pox

Swine flu

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i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.