Catalysts will activation energy of a reaction.

a)decrease b)double c)freeze d)increase

A catalyst is a substance that speeds up a chemical reaction. Catalysts will decrease activation energy of a reaction. Correct A

Adding a catalyst in a chemical reaction provides an alternative route for the reaction and has the effect of shifting the activation energy. However at the end of the reaction the catalyst is chemically unchanged

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.