Edited response:
B) Formation of sinkholes
Explanation:
"Groundwater pumping for urban water supply and for irrigation can produce new sinkholes in sinkhole-prone areas"
A zygote is the result of the formation between the two sex cells (ovum and sperm).
I think two because a seems to represent a blood cell and blood cells carry oxygen
In terms of communication, information is expressed either as the content of a message or through direct or indirect observation. That which is perceived can be construed as a message in its own right, and in that sense, information is always conveyed as the content of a message.
Information can be encoded into various forms for transmission and interpretation (for example, information may be encoded into a sequence of signs, or transmitted via a signal). It can also be encrypted for safe storage and communication.
photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
6CO2 + 6H2O + light energy = C6H12O6 + 6O2.