Well, contour lines are used to signify a three-dimensional image of a flat surfaces. They are commonly used on topographic maps. Here contour lines connect continuous points of equal elevation. There is a connection between the change of height and the relative change of distance. If you move from one contour line to another then there is a change of height. The closer the lines are the 'faster' the height changes, and thus the 'steeper' the terrain. The further apart the contour lines are, the greater distance over which height changes, the slope is gentler.
18-the first one
19-the second one ???????????????????
Answer: Bacterial cells can be genetically modified so that they have the gene for producing human insulin. As these modified bacteria grow, they produce human insulin.
Explanation:
A because Only plant cells have chloroplasts
A microbe or microorganism refers to a microscopic species that may prevail in its single-celled kind or in a colony of cells. The microorganisms comprise all the unicellular species and so are tremendously diverse. They survive in almost all the habitat from the equator to the poles, geysers, deserts, deep sea, and the rocks.
Microbes play an essential role in human culture and health. Some of the microbes act as pathogens accountable for various infectious diseases. In the given question, the following are the responses that pertain to the relative burden of human infectious ailments in the world at present:
1. Nearly 200 microbes can result in human disease at present time.
2. Various diseases that used to be noninfectious possibly do not include the microbial infection on the basis of the present studies.
3. There is an enhancement in the number of microbes, which are resistant to the drugs at present.