Salt because adding salt lowers the freezing tempurature of ice (basically it has to be colder to stay frozen)
A Limestone rock thats my answer
The answer of this question is D
Answer:
protein is the right answer
Answer:
Mature pollen grains contain two cells: a generative cell and a pollen tube cell. The generative cell is contained within the larger pollen tube cell. Upon germination, the tube cell forms the pollen tube through which the generative cell migrates to enter the ovary.
Explanation: