Stem cell research is an emotional topic. although the advancements in research are remarkable, a portion of society voices ethical reservations concerning the research. which statement would not be used by people with these reservations? a) the study of stem cells may lead to unrestricted cloning. b) stem cells for research are obtained by destroying human embryos. c) there are other avenues to find the cure to diseases that do not involve exploiting fetuses. d) researchers could use embryonic stem cells to find the cure to many disorders and illnesses.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.