Ammonia is a gas made of one atom of nitrogen and three atoms of hydrogen bonded together. therefore, ammonia is ?

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different