Question

question 11 (1 point) stars explode, and when they do they create the stuff of life: the iron in our blood, the calcium in our bones, the phosphorus that is the backbone of our dna. true false question 12 (1 point) from various investigations, we have evidence that much of our galaxy is made of material we cannot currently observe directly with our instruments. this material is called _? a dark matter b anti - matter c both d neither question 13 (1 point) the first real evidence of the big bang was _? a cosmic background radiation b galaxies moving away from us in space c both d neither

Explanation:

• Question 11: Elements like iron, calcium, and phosphorus are synthesized in stars and released when they explode (supernovae), becoming part of life - building blocks.
• Question 12: Dark matter is the material in the galaxy that cannot be directly observed with current instruments, while anti - matter has different properties and is not the unobservable material in question here.
• Question 13: Cosmic background radiation was the first major piece of evidence for the Big Bang theory. While galaxies moving away is also evidence, cosmic background radiation was the first real evidence.

Answer:

• Question 11: True
• Question 12: A. Dark Matter
• Question 13: A. cosmic background radiation