Add punctuation: GM1 affected cats have very clear symptoms before they reach maturity GM1 affected females cannot manage to carry a litter or give birth normally GM1 affected males are sterile
A: GM1 affected cats have very clear symptoms before they reach maturity - GM1 affected females cannot manage to carry a litter or give birth normally - GM1 affected males are sterile.

Add punctuation: On Friday it will be overcast with light rain Morning temperatures will be around 15 C During the day they will reach a maximum of 17 C Low temperatures at night will be around 14C We have weak easterly winds
A: On Friday it will be overcast with light rain. Morning temperatures will be around 15 C. During the day they will reach a maximum of 17 C. Low temperatures at night will be around 14C. We have weak easterly winds.

Add punctuation: What we are to do is confess our sins If we confess our sins He is faithful and just and will forgive us our sins and purify us from all unrighteousness 1 John 19
A:
What we are to do is confess our sins: "If we confess our sins, He is faithful and just and will forgive us our sins and purify us from all unrighteousness" (1 John 1:9).