This organ is a single, open chamber in insects, has two closed compartments in fish, and four in a human. What is the function of this organ?
A)
circulation
B)hearing
C)reproduction
D)
vision

Explain why the plants cortex would serve as the best food source for animals

What are the three different shapes or structures shapes or structure of carbon-based molecules?

According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this?               a.  this implies that dna and proteins aren't essential in cells today.    b.  this implies that rna can catalyze any chemical reaction that enzymes catalyze.    c.  this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna.    d.  this implies that dna and proteins evolved after rna.