2. a) a dog breathes out co, and a tree releases 02. how are the dog and the tree connected in the
oxygen cycle? (2 points)

When a dog breathes out CO, the plants absorb it. The tree releases oxygen which helps us breathe. The dog is a fueler of oxygen. The CO from the dog gets absorbed by the tree and releases oxygen.

Explanation: They are connected because the tree needs co2 to create o2 and the dog needs o2 to breathe. Without the dog the tree can't run its course and without the tree the dog can't breathe.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

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