A isn't correct because its singular and you use is not "are"
so your answer is A
Answer:
X-ray studies reveal that baby birds flap their tiny wings to help them climb steep slopes. The force generated by flapping pushes them forward as well as upward, improving traction as they climb. Non-bird dinosaurs might have done the same thing with their “mini-wings” before flight evolved.
Explanation:
Answer:
I watched from the end of the garage as two kids walked to the workbench. “I hate your board, it's too small, the axles are loose and the wheels are horrible”, the girl said to the boy as he sheepishly handed the skateboard to her. The woman angrily tore through several drawers looking for something. “Yeah I'm honestly thinking about buying an entirely new board, that one is on its deathbed”, the boy said, rubbing the back of his neck as he watched her pull out a wrench. “That would be a good idea, your board is smaller than mine and your at least half a foot taller than me so might be time for an upgrade and plus the design looks like a five-year-old did it” she responded pointing to the back of the skateboard that was lying on the workbench. They both laughed as she began to tighten something on the board. “Hey! Don’t make it too tight I still wanna be able to move” he said looking anxiously as whatever she was tightening. She glanced at him and sarcastically said “Oh sorry I didn't know you were the expert, sure thing I'll just let u ride your crooked, wobbly board and fall off, no wonder you still can’t balance yet”. She flipped the board around and began tightening something on the other side. Suddenly another man walked into the garage. “What are you two working on,?” he asked walking over. “I’m tightening the axles on his board so he doesn't fall over” She said, not looking up from what she was doing. Suddenly she stopped and dropped the board to the floor and got on it leaning to test it. “There that's way better,” she said, getting off. Then the man stepped onto the board, wobbling all over the place before he fell and a loud clattering echoed through the garage. They all laughed before collecting the skateboard and walking out of the garage.
Explanation:
I didn't know how long it had to be so hopefully this is long enough, just a short story of the time my dad fell off my cousin's skateboard.
