Which clue would tell if the lac operon is on?

the repressor protein has fallen off the molecule.

lactose is absent.

rna polymerase is blocked by the repressor.

the cell membrane changes.

What evidence is there that convection occurs in earth’s troposphere?

Could someone me with number one you

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?