Answer: 1) False
2) True
3) False
4) False.
5) False.
6) False.
Explanation: Let's analyze the sentences and see if they are logical or not.
1) "La muerte es el principio de la vida."
Here says "Death is the beginning of life", this is obviously false, does not have logical sense.
2) "El nacimiento es el principio de la vida."
"Birth is the beginning of life" This is true.
3)"En la fiesta brindamos con galletas. "
"In the party, we toast with cookies" this has no sense, so this sentence may be false.
4) "Una chica que celebra sus quince años está en la etapa de la madurez."
"A gilr that is celebrating her 15 years, is in the stage of maturity"
This is clearly false, a girl with 15 years is still a teenager.
5) "Mi abuela murió y ahora mi abuelo es separado."
"My grandma died, and now my granddad is separated" This is wrong, the word should be Viudo (widow ) instead of "separated", so this may be false.
6) "Ricardo se comprometió con Lola porque la odia."
"Ricardo engaged with Lola because he hates her" This is false, you expect here to say "love her" (La amá) instead of Hate her (La odia).