4. Distances in space involving galaxies and distant stars are too large to work with using common units. Which of the following correctly describes a unit astronomers most commonly used to measure such large distances in space?
The distance light travels in a year.
The distance across the Milky Way galaxy.
The distance Earth travels in its orbit around the Sun.
The distance across the solar system.

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3: 1. if the allele are designated (r & r) receptively. what is the probable genotypes of the round seeds which produced f 1 ? rr & rr rr only rr & rr rr only rr only

Where in the cell are ribosomes made?