He following image is a picture of the Veil Nebula made by combining several photos taken by the Hubble orbiting telescope.

The colors in the picture indicate the different elements present: blue is oxygen, green is sulfur, and red is hydrogen.

How do astronomers know which element is present where?

A. by observing chemical reactions taking place in the nebula.

B. by measuring the temperature of each part of the gas.

C. by comparing the density of the gas to the densities of various elements.

D. by looking for specific wavelengths of light that each element produces.

integrated circuit (ic) is defined as a set of electronic circuits on one small flat piece of semiconductor material, normally silicon. a functional electronic circuit requires transistors, resistors, capacitors, inductors, etc., and the connections between them.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

c. establishing proper sleep hygiene