Which of the following is most responsible for el niño?
unusually cold water in the atlantic causes an increase in wind activity.
the calming down of trade winds in the pacific, which leads to the buildup of warm water.
death of plankton and fish in the northern hemispheres.
disruption of the gulf stream.

Liquid water turns into water vapor at which step in the water cycle

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.

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes