What is a physical or mental representation of an object or an event

Na20 How many atoms of each element are in this compound? A) 2 sodium atoms and 1 oxygen atom B) 2 sodium atoms and 2 oxygen atoms C) 1 sodium atoms and 1 oxygen atoms D 1 sodium atom and 2 oxygen atoms

Describe the physiological changes that occur after the ingestion of salty food. Include those cells and structures that are involved in these changes.

The boundary between the middle and inner ear is the

Which statement taken from a student's logbook would beconsidered an experimental result? a. The speed of a snail isb. The average speed of the controlc. A mercury thermometerd. If temperatureaffected by temperature. group of snails is 2.4 cm/min.

Is C6H5F organic or inorganic

What it a dilute solution

Is Chitin a Carbohydrate or a Protein?

You want to compare the evolutionary relationships between four species of birds, which of the following would be most useful? Question 1 options: A) nesting behaviors B) DNA sequences C) color of feathers D) patterns of migration

Two hypotheses about how life supporting molecules appeared on earth

Dna strands serve as which of the following during dna synthesis