Which of these animals would most likely be found in a tundra biome

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Plz ! a frog has a genetic mutation in skin cells that causes part of its skin to turn orange the frog will not pass this genetic mutation onto its offspring because, a. the offspring will inherit skin cells from the other parent. b. mutated skin cells cannot divide and produce daughter skin cells. c. skin cells do not contribute genetic material to sex cells. d. parents do not contribute genetic material to their offspring.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?