Natural selection can cause speciation, which increases the biodiversity of an ecosystem. Several bacterial colonies are placed on a petri dish that contains agar with antibiotics. After 24 hours, ninety percent of the original bacteria die, but the remaining ten percent survive and later reproduce.
Answer:
Taking into account the concepts presented in chemistry with respect to elements and compounds, it is possible to affirm that the compounds are formed by two or more elements.
Explanation:
Two or more chemical elements have the ability to bind -by forming bonds- to obtain a compound. This occurs randomly in nature.
The bonds between the elements that form a compound must be stable enough to ensure the stability of the molecule. A chemical compound can only be separated into the elements that form it by chemical processes.
The bonds types that form compounds can be:
- <em>Ionic bond.</em>
- <em>Covalent bond.</em>
- <em>Coordinated covalent bond.</em>
- <em>Metallic bond.</em>
It is necessary to mention that chemical elements are called atoms, and the bonds between them are molecules. The physical and chemical properties of a compound will be different from the properties of the elements that form it.
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The process in which the environment<span> selects </span>organisms<span> that will survive is called natural selection. It starts with overproduction; when an </span>organism<span> produces more offpsrings than can survive. The second is variation. Because there are so many offsprings, there will be variations.</span>
The oak tree fungal pathogen, Phytophthora ramorum, has migrated 800 kilometers in 15 years. West Nile virus spread from New York State to 46 other states in 5 years. The difference in the rate of spread is probably related to the mobility of their hosts
<h3>What is
West Nile virus ?</h3>
West Nile fever is brought on by the single-stranded RNA virus known as the West Nile virus (WNV). It belongs to the same genus as the Zika virus, dengue virus, and yellow fever virus, Flavivirus, and is a member of the family Flaviviridae. Mosquitoes, primarily Culex species, are the main vectors of the virus. Since birds are the major hosts for WNV, the virus continues to spread via a "bird-mosquito-bird" cycle. The virus shares genetic ancestry with the family of viruses that cause Japanese encephalitis.
The virus causes disease symptoms in both humans and horses, and symptoms are hardly seen in other animals. In Uganda, the human sickness was first recognized in 1937, and in the second half of the 20th century, it spread to many other countries.
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