Answer:
The respiratory system brings oxygen unto the lungs, while the circulatory system delivers oxygen throughout the body.
Explanation:
A) causes an effector to signal the control center of an organism, which creates the stimulus to make a response
The answer is cancer drugs. According to a united nations University Report, almost 62 percent of all discovered and distributed cancer drugs have been made or derived from the discoveries of medicinal plants. Cancer Drugs are usually made from Medicinal Plants, because they contain more effective effects than other substances.
<span>the answer is :
permanent magnets
</span>A permanent magnet<span> is an object made from a material that is </span>magnetized<span> and creates its own persistent magnetic field. An everyday example is a </span>refrigerator magnet<span> used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called </span>ferromagnetic<span> (or </span>ferrimagnetic<span>). These include </span>iron<span>, </span>nickel<span>, </span>cobalt<span>, some alloys of </span>rare-earth metals<span>, and some naturally occurring minerals such as </span>lodestone<span>. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of </span>magnetism<span>.</span>
