Bobby completed a gym workout today. He focused on his upper body, completing biceps curls, triceps dips, pull-ups, and chest presses. a. support
b. protection
c. movement
d. communication

one would be wind another would be water density

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

i think this picture will you.