Human impact on river ecosystems are:
pollution
flow modifications
exotic species
harvesting.
Human activity have great aftermath in terms of changes to rivers and streams activity and ecosystem. The interrelationship of all living organisms have within their environment is extremely complex.
Answer:
Useful for humans to fight against insect
Explanation:
BT toxin is an insecticide toxin naturally produced by the bacteria Bacillus thuringiensis. Using genetic engineering plant were transform to produce it too, by adding the gen that codes the toxic protein "BT". Once an insect eats the genetically modified plant, BT proteins interacts in their midgut, harming the insect and killing it.
Pretty sure it’s supposed to be 98.8%
This is referred to as allopatric speciation where species are separated geographically and evolve into two different species over time
Answer:
Many biofilm-specific phenotypes are controlled by "quorum sensing." This system allows bacteria to regulate gene expression according to the concentration of <u>bacteria</u>.
Explanation:
Quorum sensing is basically a process which depends upon the <u>density dependent communication </u>of bacteria. Higher the number of bacteria, more will be the communication. Example of quorum sensing is biofilms which grow on various surfaces.
Some auto-inducers like peptides and N-acyl homoserine lactone are produced by bacteria during this process which in turn activate some transcription factors to cause gene expression.
In bacteria, it mainly serves the purpose of bioluminescence, sporulation and nitrogen fixation.