1) Which of the following statements is true about a light year? A) It is the distance to Alpha Centauri.
B) It is shorter than the astronomical unit.
C) It is used to measure long periods of time.
D) It is used to measure long distances in space.

2) Which of the following describes a difference between galaxies and solar systems?
A) Galaxies contain only moons, while solar systems contain planets.
B) Gravity holds solar systems in orbits but does not exist between stars in galaxies.
C) A galaxy is a collection of millions of stars, while a solar system is a star and the planets around it.
D) It's easier to use astronomical units to measure distances in the galaxy but use light years for measurements in a solar system.

3) The distance from the sun to Earth is one astronomical unit (AU).
True
False

Plants that have reproductive structures called cones are?

In 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? in 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. these bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.

Which is the function of the hypothalamus in thermoregulation? answers: -sensor -effector -stimulus -intergrating center it's either a or c i believe