Natural selection. The best survive
The number of protons in an atoms nucleus is called the atomic number.
Answer:
eukaryotic cells
Explanation:
Mitochondrion. Mitochondrion, membrane-bound organelle found in the cytoplasm of almost all eukaryotes cells (cells with clearly defined nuclei), the primary function of which is to generate large quantities of energy in the form of adenosine triphosphate (ATP).
The correct answer should be B. Small regions interspersed with other biomes. This type of a biome is found on all continents and in many countries. It's specific because it's similar to a desert when it comes to yearly precipitation, but it is different insofar that it has a lot of plants and animals that are mostly nocturnal predators.
Glucose enters most cells by facilitated diffusion. There seem to be a limiting number of glucose-transporting proteins. The rapid breakdown of glucose in the cell (a process known as glycolysis) maintains the concentration gradient.