Q1. Solid - A, B & C
Liquid - D & E
Gas - F
Q2. C & D
B & C
E & F
I hope that’s helpful.
Answer: B - Rock concert
Explanation:
Noise pollution can be define as an environmental pollution which is caused by the emission of elevated levels of sound for a considerable long period of time. The elevated level of sound may have an adverse impact over the human and other animal hearing ability. According to world health organization, the sound level beyond 85 db for a period of 8 hours is hazardous.
Among the options given, rock concert is the correct. The rock concert is associated with noise pollution as it will involve the use of loud speakers with high volume which can cause heart problems and hearing impairment.
Answer:
CRISPR-Cas9 is a DNA modification technique derived from a bacterial defense mechanism.
This breakthrough innovation allows the deletion and insertion of genes in a simple, fast and efficient way, much like "DNA scissors".
The CRISPR-Cas9 method is increasingly used in laboratories because it has several advantages over the DNA cutting enzymes developed before it.
First advantage, it is much easier to use (compared to other gene-editing tools). It has already allowed several teams of researchers to target several genes at once, including in human cells.
Other major advantages resulting from the simplicity of the system: its speed and its low cost. The CRISPR-Cas9 method takes only a few days (instead of a few months) and is at least ten times less expensive than those used before.
CRISPR-Cas9 is therefore a tool of disconcerting ease to modify the genome of many types of cells (to produce a protein for example), in bacteria, plants, animals and perhaps one day in humans.
