You’re answer is C. I hope this helps!
Hope this helps this is what I used when I studied this
It would be 'Cold water sinks, warm water rises, creating a convection current.'

Saliva contains Salivary Amylase, which helps in breakdown of sugar.
So, correct choice is (a) Amylase.
In plants, there are three types of carbon fixation during photosynthesis: C3 – a plant that uses the Calvin Cycle for the initial steps that incorporate CO2 into organic matter, forming a 3-carbon compound as the first stable intermediate. Most broadleaf plants and plants in the temperate zones are C3