How do all organisms begin? as one single cell
It depends on whether the adult organism is single-celled or multi-celled.
as a collection of cells
as a group of daughter cells

1. / A.

Explanation:

Its the first answer (as one single cell)

Because that's how all organisms begin life as a single cell some organisms begin life as a single cell and others as multi-cellular.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.

condenser is used to focus in the light microscope.