Answer:
B. true, because immunity is nonexcludable, and everyone can simultaneously enjoy the "herd immunity."
Explanation:
When a lot of people get vaccinated against a disease, the chances of spreading of that disease drastically decreases in the population. Even if someone is not vaccinated against that disease, their chances of contracting it are low because other people are vaccinated and hence its incidence rate in population is low. This phenomena is called as herd immunity. For example: 19 out of 20 people should be vaccinated against measles to protect the non vaccinated ones.
Herd immunity benefits the entire public and is considered a classic public good. It is nonexcludable which means that someone can not be excluded from being benefited by it. Two people residing in the same population will reap the benefits of herd immunity even if the degree of benefit might be different.
Answer:
One of two or more alternative forms of a gene that are there because of mutation and are found at the same place on a chromosome.
Answer: C) Tim did not use a control group
Explanation:
because.....
the whole point of a control group is where comparisons are made in an experiment.
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Answer:
The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false. Step 2. Form a hypothesis.
Explanation:
<span>Protists can be unicellular, colonial or multicellular. Each type of protist has its own phylums or divisions. Protozoans are animal-like. Bacteria and other one-celled organisms are typical prey for a protozoa. Some examples of a protozoa are mosquitoes and amoeba. Algae are photosynthetic and are grouped into divisions depending on pigment similarities. A few examples of algae are sea lettuce and kelp. Fungus-like protists are often brightly colored and get their nutrition by absorbing nutrients from their environment.</span>