They had to change they way they live which is quite difficult it is like you going to a new school in a new state and not being used to anyone
There are thousands of bacterial species and they are not identical towards one another, therefore there forms are quite unique. so its just there characteristics that make up how bacteria look like.
Hope this answers your question.
Answer:
life will not possible on Earth I think so
Light is a form of EM radiation.
EM radiation has no mass (it's just energy packets called photons).
EM radiation can travel through a vacuum. (The speed of light in a vacuum is called c and is around 300,000 m/s).
Hope this helps!
For males, they are produced in the Testes or male testicle.