Answer:
The answer is A, Both have a crest and a trough.
Explanation:
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Organ Systems. When a group of organs work together to carry out a body function this is the what it is called.
Integumentary system. This is the external covering of our body, our skin.
Skeletal System.
Muscular System.
Nervous System.
Endocrine System.
Cardiovascular System.
Lymphatic System.
It’s important to use safety equipment for in line skating and skateboarding because with safety equipment when accidents occurs you are sure of not sustaining injuries and also not to lose your life. It’s always advisable to properly secure yourself before starting such games.
