The simpliest answer is....the respiratory system gets oxygen and removes carbon dioxide.
---breathing describes the process of inhaling and exhaling air.the exchange of gases( oxygen and carbon dioxide)between living cells and the environment is a process known as respiration...
hope it helps my answer...
Answer:
A
Explanation:
D is quarter moon B is half moon A is ¾ moon and C is full moon
Laboratory helps you identify things rather than the others using controlled variables
Answer:
Whereas carbohydrates provide a readily available source of energy, lipids function primarily as an energy reserve. The amount of lipids stored as an energy reserve far exceeds the energy stored as glycogen since the human body is simply not capable of storing as much glycogen compared to lipids.
Explanation:
PRESS THE CROWN
Answer:
Hagfish and Lamprey
Explanation:
Vertebrates are the organism which posses vertebral column or the spinal cord in their skeleton.
The earliest vertebrates had the cranial structures or head but they lacked the vertebral columns and the jaws. These earliest vertebrates lived around 500 to 600 million years ago.
The earliest vertebrates which lacked the vertebral columns and are still alive are the Hagfish and the sea lampreys. These are considered the earliest vertebrates as they lacked the jaws.
These jawless fish are the ancestors of the cartilaginous and bony fish which later developed into amphibians and other groups of animals.
Thus, Hagfish and Lamprey are the earliest vertebrates.