Answer:
If the question states "the role of bile salts in the alimentary canal is" not "the role of bike salts in the alimentary canal is" then the role of the bile salt is to act as detergents and emulsifying large fat droplets into small ones
Density. Density is the measurement of how much matter is in a substance
Its b. Ecosystem
Population is the number of a species in an area, it has nothing to do with physical characteristics.
Abiotic is just an adjective meaning not alive
Competition is just the interactions between organisms in the struggle for food, water, space, mates, and many other things again not physical characteristics
There are many forms of VIF and each forms are made for different purposes. basically, you just extract a female egg and a sample of the male sperm, bad sperm can be separated via by adding specific chemicals. The sperm will then be transferred into the egg and the egg is transferred into the women. (This is ICSI) There are other forms under the category of IVF but this is one of the example. (ICSI only deals with male infertility)
A should be the correct pair