What do astronomers use to calculate the age of the universe? Select three options.

dark energy
the age of rocks on Earth
the age of the oldest stars
patterns of background radiation
how fast distant galaxies are moving away from us

You see a white marker with an orange circle and black lettering. what does this marker tell you

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

What is a limitation of using a chemical formula, such as c6h1206, to represent a compound? the chemical formula does not show the types of elements that make up the compound. the chemical formula does not show how the atoms are connected to one another the chemical formula does not show the number of atoms of each element in a molecule. the chemical formula does not show the chemical symbols of the elements in the compound