If heat is required for a reaction to occur, it is an endothermic reaction. Endothermic reactions absorb heat from their surroundings in order to proceed.
A concentration gradient and a (semi-)permeable membrane.
A genetic mutation within the population.
they reduce the activation energy required for the reaction to occur
they reduce the activation energy required for the reaction to occur
The temperature required for nuclear fusion to occur is around 100 million degrees Celsius.
Evolution occurs in population not in an individual.
Endocytosis requires energy in the form of ATP to occur.
oxygen
A population is a group of similar organisms that occur in a specified habitat.
If heat is required for a reaction to occur, it is an endothermic reaction. Endothermic reactions absorb heat from their surroundings in order to proceed.
adinotryphosphate
the amount and kind of genetic variation in a population
ecological exclusion
because the fountain is magic
The word "expected" is not the same as "required". Something that is "expected" is something that is assumed will occur. Something that is "required" is something that is essential.
A concentration gradient and a (semi-)permeable membrane.