Uranium is an element. Which type of matter is uranium? A. A pure substance
B. A homogeneous mixture
C. A compound
D. A heterogeneous mixture​

What do butterflies have on their feet which allows them to sense different strengths and types of nectar? a. mechanoreceptors b. acoustic receptors c. substratum receptors d. chemoreceptors

Why does the input force have to be greater than the force needed to lift the bale?

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied