Which explanation best describes the organization of the human body?

the body is made of cells. the cells are organized to build organs. a group of organs make up a tissue. a group of tissues make up a system.

a group of cells work together to form a tissue. a group of tissues work together to form an organ. a group of organs work together to make up a system.

tissues are the building block of all living things. tissues work together to make up systems. systems work together to make up organs. the organs work together to build a human.

there are a number of systems in the body. the systems are made of tissues, which work together to make cells. the cells make up the organs. the organs make up the tissues.

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles.b) the viral genome codes for specialized enzymes not in the host.c) the virus infects only those cells and species that can perform all the replication roles necessary.d) viruses can stay in a quiescent state until the host cell evolves this ability.