<span>ecosystems
</span>An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system. <span> </span>
<span>Chronic stress that weakens systems in the body.</span>
The first option is correct.
A radio wave has a longer wavelength and a lower frequency than an infrared wave.
Hey you! Here's your answer:
1) Scientists discovered ways to derive embryonic stem cells in 1981, more than 30 years ago.
2) Canadian Scientists Dr. James Till and Ernest McCulloch, who did pioneering studies in stem cell research, were the first to discover stem cells.
3) Thousands of experiments and studies have already been conducted on stem cells and research.
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