Look at the chart below and determine which group of organs are grouped together to correctly represent that organ system
Group
Organs
Organ System
Function of Organ
System
Break down food for nutrient absorption
1
Mouth, stomach, blood vessels
Digestive system
Circulatory system
2
Heart, kidneys, small intestine
Transport nutrients and gases
3
Lungs, trachea, veins
Respiratory system
Gas exchange
Control through electrical signals
4
Brain, spinal cord, nerves
Nervous system
O
Group 1
o
Group 2
о
Group 3
Group 4

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.