What main characteristic defines the lithosphere, in contrast to other layers of the Earth?
O It creates the Earth's magnetic field.
O It is more dense than all the other layers
O It is thicker than all the other layers
It breaks instead of flowing or bending.

If the coding part of an mrna molecule is 1800 nucleotides (bases) in length, this molecule will contain codons and code for a polypeptide that is amino acids long.

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Which of the following best describes the relationship between glucose and complex molecules such as hormones?