Will give + extra points for correct answer Penguins come to nest in colonies inland on the ground, in rock crevices, or burrows, but the nesting sites get very crowded. If a pair does not find room to nest, they might not be able to raise their offspring. What is the limiting factor?

there is no

explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds