Selective pressure could be any phenomena that would most probably alter behavior and fitness of living organisms in an environment. It is the driving force of evolution and natural selection. Thus, selective pressures influence or leads to the evolution of organisms. Some of the organisms will not survive, reproduce thus, some members of the generation will not be able to pass their genes to the next generation.
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Embryotic stem cell research benefits our society with the possibility of it helping various diseases and it only requires a small number of cells. The negatives of stem cell research are the cost and ethical controversary. To start, stem cell research could help with diseases like Alzheimer's and certain cancers like Parkinson's. Also since cells replicate incredibly fast, procedures wouldn't need many cells depending on the case. Stem cell research can vary in costs from about $5000 to $20,000 which for many people is difficult because stem cells are very temporary in many cases. Many groups of people don't agree with stem cell research since human embryos are destroyed in the process of harvesting embryonic cells and it is "potential life".
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D, A, C is the answer I believe in
The rock cycle<span> is a basic concept in </span>geology<span> that describes the time-consuming transitions through </span>geologic time<span> among the three main </span>rock<span> types: </span>sedimentary<span>, </span>metamorphic<span>, and </span>igneous<span>. As the diagram to the right illustrates, each of the types of rocks is altered or destroyed when it is forced out of its equilibrium conditions. An igneous rock such as </span>basalt<span> may break down and dissolve when exposed to the </span>atmosphere<span>, or melt as it is </span>subducted<span> under a </span>continent<span>. Due to the driving forces of the rock cycle, </span>plate tectonics<span> and the </span>water cycle<span>, rocks do not remain in equilibrium and are forced to change as they encounter new environments. The rock cycle is an illustration that explains how the three rock types are related to each other, and how processes change from one type to another over time.</span>