PLEASE HELP 1. Although organisms often share similar genes, they may have significant phenotypic differences. Which statement explains why this may occur?

Although DNA is always expressed, the gene products may not always be used by the organism.
Gene expression is controlled by regulatory genes, regulatory elements, and transcription factors.
Not all organisms have control mechanisms, so genes may sometimes be overexpressed or not expressed at all.
The types of nitrogenous bases differ between organisms, causing gene sequences to produce different proteins.

In 2015, about ten percent of total u. s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power