Question

4.brain is located in a bony box is called______
5. The brain weigh_____% of the body,but it uses_____ %of the oxygen of the body.​

Answer 1

Answer:

pls mark as brainlist answer

Explanation:

Weighing at just 2% of the total body weight, the human brain is probably the most complex structure. It is the centre of control of all the body functions and senses. The average weight of the human brain is around 1.5 kg and it contains about 86 billion nerve cells (neurons) that control every action you take. 

Answer 2

Answer:

1) more than one billion nerve cells

2)When soils become saturated with water, oxygen content is reduced which may result in reduced photosynthate production and subsequently, fruit shed occurs

3)parathyroid horomone

4)Cerebrum

4)cranium

5)2%

20%

Explanation:

Hope it helps !!!

Mark as brainliest please