Bones grow and fuse and then they get weaker
Muscles become gradually weaker as time goes on
Nerves stop sending signals as efficiently
Reproductive system in females is unable to produce eggs for fertilization for babies in the older adulthood.
Answer:
hydroshpere and biosphere
Explanation:
it contains
hydrosphere: cleaning of water
biosphere: helps plants and animals
The hypothalamic−pituitary−adrenal system helps maintain balance in the body by directing the sympathetic nervous system, as well as the endocrine system, immune system and digestive system. The hypothalamic−pituitary−adrenal system mainly controls the cortisol levels and the sympathetic nervous system, but it also plays a role in regulating hormones in the endocrine system, and it moderates the immune system and the digestive system.
B. the oceans is the largest ecosystem.
Hey, there!
Question: Which level of classification contains all the others
Answer: 
(
Option B)
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