All of the living things in San Francisco, California make up View Available Hint(s) All of the living things in San Francisco, California make up an ecosystem. a population. a community. a biogeochemical cycle.

an ecosystem

Explanation:

All of the living things in San Fransisco make up an ecosystem.

A biological ecosystem, by definition, is a system of all the living organisms occupying an area who are in constant interaction with themselves and the non-living portion of their environments. In other words, an ecosystem is a community of all organisms in an area that interacts with each other and with the non-living components of their communities.

All the living things in San Fransisco, California would be made up of different communities of plants, animals, and microbes. These communities would definitely be interacting with themselves in one way or another and also interact with the abiotic components of their environment. Hence, they together constitute an ecosystem.

a chair, a bed, and a toothbrush

explanation:

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: