Question

question 18 (5 points) listen scientists have recently discovered one the smallest stars on record. how long will this star last compared to a larger star formed at the same time? a) the larger star will last longer than the smaller star because it attracts more nebulae. b) the smaller star will last longer than the larger star because it burns less fuel. c) the larger star will last longer than the smaller star because it uses fuel more efficiently. d) the smaller star will last longer than the larger star because it has a smaller chance of getting hit by an asteroid. question 19 (5 points) listen on earth, where is hydrogen not found? a) mine b) water c) natural gas well d) atmosphere

Explanation:

For Question 18: Smaller stars have less mass and burn through their nuclear fuel at a much slower rate compared to larger stars which consume fuel rapidly due to higher core temperatures and pressures, so they last longer.
For Question 19: Hydrogen is present in water (H₂O), in natural - gas (which contains methane CH₄ with hydrogen), and in trace amounts in the atmosphere. Mines are not a typical place where hydrogen is found in significant amounts.

Answer:

Question 18: B. The smaller star will last longer than the larger star because it burns less fuel.
Question 19: A. Mine