alayciaruffin076
26.04.2021 •
Biology
A bird flies by moving its wings up and down. Which two systems are most directly responsible for the movement of a bird's wings?
A bird flies by moving its wings up and down. Which two systems are most directly responsible for the movement of a bird's wings?
A.
respiratory and muscular systems
B.
skeletal and digestive systems
C.
respiratory and digestive systems
D.
skeletal and muscular systems
Solved
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Ответ:
I thought it is D since he need his muscle and bons to move and fly
Ответ:
D
Explanation:
skeletal and muscular systems
Ответ:
Prokaryotic cells only have free-floating DNA, while eukaryotic cells have DNA enclosed in a nucleus.
Explanation: