The answer is bingell Johnson act
Producers are typically plants, so I believe the correct answers would be 2, 3, 4.
<span>There are three phases of clnic study and one post approval phase required by the Food and Drug Administration (FDA) for a New Drug Application (NDA). Phase IV which is a common stipulation by the FDA includes continual evaluation of the drug after approval has been granted.</span><span />
Answer:
Electron microscope would be used for if,
C) details of cell structures needed to be distinguished.
Explanation:
- The general principal of electron microscopy is analogous to light microscopy except that it uses electrons to analyse the specimen instead of light.
- Electron microscopy focuses a beam of electron on the target sample and records the difference in absorption by different surfaces.
- Electron microscopy is used to get the detailed structure of cells and surface features of various viruses and bacteria.
- However, it is not possible to view living biological samples through electron microscope because high velocity electron have immense energy to kill living cells.
- These samples are thus, fixed and then viewed.