HELP ME this is a K12 question

The weather is warm and dry.

Which change would a cold front bring?

rain or thunderstorms

extended period of rain or snow

dry air and sunny skies

several days of gray skies

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight.which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

The model illustrates a process by which a substance is taken up by a cell

Recombinant dna (rdna) creates offspring which are genetically identical to the parent is the process of breeding only organisms with desirable traits involves the removal of the nucleus of a cell combines genes from organisms of different species in a lab