Question:
Relying on an animal to come by is risky. A flower may have to wait a long time for the right animals to come by. What if one never passes close enough to the flower? Hoping the wind will blow is also risky for a plant. What if the wind does not blow? What if the blowing pollen does not land on another flower? The wind could even blow the pollen over the ocean where it is wasted. Giving free nectar is costly. It is not a good use of the plants energy. A plant uses a lot of energy to produce nectar. Some animals may just drink the nectar. They may not carry off any pollen in return. To improve their chances, plants evolved special traits. For example, they developed ways to hide their nectar. Only certain animals were able to get at the plants hidden nectar. These specific animals might be more likely to visit only flowers of the same species. This was also a benefit for some animals. Animals also evolved special traits to get to the nectar. After reading the above, is "The animal might not come by, or might just drink all the nectar" the correct answer to the question "Why is it risky for a flower to wait on an animal to come by?"? OPTIONS:
- no
- yes

Answer:
yes

Question:
Surely, you have noticed the tall poles along the roadside. Do you know what is on top of those poles? Thats right, wires that carry electric current. These wires carry electric current to your home. But what is electric current? Electric current is actually the flow of electrons. You may recall, an electron is the outer-most particle in an atom. They have a negative charge. Electricity is the continuous flow of these particles. Electrons are able to move through wires. Their speed can even be measured. The SI unit for electric current (or speed) is the ampere (A). Ampere is often shortened to amp. Electric current may flow in just one direction, or it may keep reversing direction. Direct current (DC) flows in only one direction. Direct current is what is used in devices like flashlights. Alternating current (AC) flows in two directions. This is the type of current that flows into your home through wires. After reading the above, is "Charged particles causing electric current" the correct answer to the question "What is an Ampere?"? OPTIONS:
- no
- yes

Answer:
no

Question:
The old vaulted church was stripped down: there was no cloth on the altar, just a DJ's toolkit and his beer. Through the dark, I could see three bolts left in the wall from where they'd taken down the crucifix. A confessional too beaten-up to have been sold was shaking in a way that suggested activity inside, and where the pews had been taken out, a couple hundred people were testifying to the DJ's moving sermon. Rachel stepped forward into the crowd while I took a moment to drink in the ceiling's blue-lit, shadowed vault and the light-catching haze from who-knows-what rising between the DJ and the crowd. There was a terrific echo, each beat reverberating inside of the next, and the old stained-glass windows rattled in their frames. On the dance floor, people moved with their eyes closed and their hands in the air. I danced with Rachel for a while, but then something by the bar seemed to be pulling her eyes. She told me that she was heading for a drink and slipped out of the crowd. When she hadn't come back halfway through the next song, I glanced over at the bar. It was just a little set-up where someone had stacked a few crates and brought something alcoholic to share, mostly beer. Rachel was standing with a plastic cup, looking like she was having a conversation, but I couldn't see anyone else there. The next time the crowd split, I saw him. He stood in front of a blue light, so I couldn't see him clearly, but what I saw was memorable. He wore a jacket of what might have been blue velvet, and his hair gleamed black against his white skin. The blue haze seemed to stop just shy of his pallor, setting off his striking face without illuminating its details, and his wrists flashed white in the darkness. He didn't move, just stared and held his drink. The next time I saw them, his mouth was moving. She nodded and he took her arm. I watched them through the crush of dancers as they squeezed along the wall, and the feeling came to me that something was very wrong. Saturday morning, I woke up and saw that she still hadn't come home. After reading the above, is "Three bolts in the wall" the correct answer to the question "What was left when the crucifix was taken down from the wall at the old vaulted church?"? OPTIONS:
- no
- yes

Answer:
yes

Question:
Gravitational Potential Energy is affected by position. Like the leaves on trees, anything that is raised up has the potential to fall. It has potential energy. You can see examples of people with gravitational potential energy in 1.5 Figure below. Gravitational potential energy depends on two things. It depends on its weight, because a large falling rock can do more damage than a leaf falling from a tree. It also depends on its height above the ground. Like the skateboarder, the higher the ramp, the faster he will be going when he reaches the bottom. Like all energy, gravitational potential energy has the ability to do work. In this case, weight has the potential to deliver a force. More important for us is that it has the ability to cause change. What kind of change you may ask? Gravitational potential energy has the ability to cause motion. After reading the above, is "It gives it the potential to move" the correct answer to the question "What affect does gravitational potential energy have on leaves?"? OPTIONS:
- no
- yes

Answer:
yes