I really hope this helps!
The main dangers worldwide are population growth and resource consumption, climate change and global warming, habitat conversion and urbanisation, invasive alien species, over-exploitation of natural resources and environmental degradation.
DNA in prokaryotes are not bounded by Nuclear Memberane !! It is scattered all over cytoplasm !!
No, polar bears does not migrate.
They are the powerhouses of a cell and they act like the digestive system which takes in nutrients and breaks it down, then creates energy. Hope this helps!
;D
