Need the answer ! what are mutations? a. changes in nucleotides of a dna molecule that effect the genetic message. b. repairs of damage to dna molecules by specialized enzymes c. removal of damages dna nucleotides by enzyme molecules d. reduction in the rate of replication of dna due to regulatory mechanisms

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced. be sure your answer has the correct number of significant digits.