Ablack hole pulls in gas from a nearby companion star. crossing the event horizon, this matter heats up and emits a. after; x-rays b. before; x-rays c. after; infrared radiation d. before; infrared radiation

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it

In the practice of science, this type of reasoning is used to develop explanations.

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid