Answer:
One difference between the Rhesus system and the ABO group system is that Rh negative people don't usually possess antibodies against RhD (unless they have been previously exposed to it), whereas in the ABO group system if the antigen is absent from the red blood cells.
Here is the link to read more :)
https://www.mydr.com.au/tests-investigations/blood-typing
Answer: Never swim alone
Explanation: You have to at least have one person with you, you cannot swim be your self just in case something happened to you nobody would be there to help.
It depends what subject and things like that, if it is to encourage you. you could find motavotional speakers on youtube
