Which of these statements refers to convection?

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some of this energy is reflected off earth's atmosphere.

sunlight travels through space without the aid of fluids or solids.

warm air rises and takes the heat with it; eventually, it cools and sinks.

land and ocean absorb and re-emit heat from the sun.

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red.b) the pollen grains will be pure blue.c) the pollen grains will have red interiors and blue exteriors.d) the pollen grains will have blue interiors and red exteriors.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.