Misc: His designs focused on maximum output from minimum material and output?

Questions

On average, elephants sleep for about ________ per day?

A giraffe's neck contains the same number of ________ as a human?

An electric eel produces an average of ____________ volts?

Spiders' webs are a traditional natural ______ _______, when applied to a cut they quickly stop the flow of blood?

The orang-utan's warning signal to would be aggressors is a loud?