Which statement describes the importance of the nitrogen cycle to living things check all that apply

Answers are: b) It help cells make protein ; c) It provides a form of usable nitrogen.

Nitrogen cycle is important for all living things as nitrogen is an important constituents of amino acids which makes protein, nucleic acids such as DNA and RNA, ATP and other compounds which are essential for life. During Nitrogen cycle, nitrogen is fixed into ammonia by bacteria. Ammonia is converted into nitrite and then to nitrate. Nitrate is the most usable form of nitrogen by plants. Animals feed on plants to get nitrogen. After death of plants and animals, they decomposed by bacteria and nitrogen is cycled back to atmosphere.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.

answer: b

coz red blood cells marrow and circulates the body for 120 days.