Free points bc it’s 11:16pm and I’m very bored doing this math test thing lol. Why is the sky blue?

How many hours in one day?

What’s the first letter of the alphabet?

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

What are positive impacts of algae? how is it used?