Why is the gallbladder absent in rats?

Charles Darwin observed the resemblance between organisms on the Galápagos Islands and those on the nearest coast. He hypothesized that the island organisms had evolved from the coastal organisms. What mechanism did Darwin propose caused evolution?

Which of the following is a biotic factor in an ecosystem? sunlight, water, soil, plants

Which of the following is not a type of tissue of the human body? a. bone b. muscle c. connective d. epithelial

What are routes followed by nerve impulses as they pass through the nervous system?

Which of the following holds true for energy coupling? A. Energy is released in an exergonic reaction. B. Energy is transferred from an exergonic process to an endergonic one. C. Energy is consumed in an endergonic reaction.

In order to grow, all organisms must

The DNA in a cell's nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell.

What similarity do animals and plants share?

This is a model of a bacterial cell. What statement about the structure and function of bacterial cell parts is correct? A) DNA is contained in a primitive nucleus. B) Energy for movement is generated in the pilli.

How can the locations where ancient fossils are found be used as evidence for continental drift