Hey there can you please give me some nice ideas for a biology investigatory project .I ought to submit it by Thursday .please help me it is for my 30 marks in class 12 .please help or I'l sink

Thursday? That's in a little more than 24 hours! The problem is that we don't know what level of biology you're doing...

Ok, I'll try anyway...

Investigating the human digestion system, the optimum pH required for each enzyme in the system...

The different cells you have in your body... how many types, etc

The ecosystem, there're lots of investigations

Think about the chapters you did, you'll surely find something that you've always wanted to know about.