Answer:
D
Explanation:
Your first order of business should always be to see which answers involve both of the systems. A has the circulatory system (blood) but no respiratory system (intestines are the gastrointestinal system), B has the respiratory system (the lungs) but no circulatory system, C has the circulatory system (new red blood cells) but not the respiratory system (bones are the skeleton), and that just leaves D, so it has to be the answer. When you look at it to check, it includes both systems, as the lungs are part of the respiratory system and the blood is part of the circulatory system.
9 0f them are both and the rest are animal or plant
Answer:
the nitrogenous bases form hydrogen bonds between opposing DNA strands to form the rungs of the Twisted ladder or double helix of DNA or biological catalysts that is found in the nucleotides.
Explanation:
hope this helps :]
Usually patient's with pica are missing a nutrient in their diet..blood testing is the usual method to discover what nutrients are missing.could also b due to a mental illness..
