a dam is built that separates a river into two sections—a deep upstream section and a shallow downstream section. when the dam is first built, a fish species is able to move from the upstream section into the downstream section, but not vice versa. predators can more easily catch the fish in the shallow downstream section than they can in the deep upstream section. which scenario is most likely to lead to speciation?

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).

energy and particles

the scientific method.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.