Q: Q: What were the first vertebrates to evolve? Read this paragraph and choose the correct option from the provided answers: Fish were the first vertebrates to evolve. The earliest fish lived in the water, and modern fish are still aquatic. Choices: - snail - trees - shark - fish A:
A: fish

Q: Q: A lens of what shape causes rays of light to diverge, or spread apart, as they pass through it? Read this paragraph and choose the correct option from the provided answers: A concave lens is thicker at the edges than it is in the middle. You can see the shape of a concave lens in the Figure below . From the diagram, it's clear that the lens causes rays of light to diverge, or spread apart, as they pass through it. Note that the image formed by a concave lens is on the same side of the lens as the object. It is also smaller than the object and right-side up. However, it isn't a real image. It is a virtual image. Your brain "tricks" you into seeing an image there. The light rays actually pass through the glass to the other side and spread out in all directions. You can explore the formation of images by a concave lens at this URL: http://phet. colorado. edu/sims/geometric-optics/geometric-optics_en. html. Choices: - convex - flat - elongated - concave A:
A: concave

Q: Q: What term describes a disease in which the immune system attacks the body's own cells? Read this paragraph and choose the correct option from the provided answers: An autoimmune disease is a disease in which the immune system attacks the body's own cells. Why this happens is not known for certain, but a combination of genetic and environmental factors are likely to be responsible. Type 1 diabetes is an example of an autoimmune disease. In this case, the immune system attacks cells of the pancreas. Two other examples are multiple sclerosis and rheumatoid arthritis. Choices: - contagious - inflammatory - acute - autoimmune A:
A: autoimmune

Q: Q: A major step in animal evolution was the evolution of what rigid rod that runs the length of the body? Read this paragraph and choose the correct option from the provided answers: Another major step in animal evolution was the evolution of a notochord. A notochord is a rigid rod that runs the length of the body. It supports the body and gives it shape (see Figure below ). It also provides a place for muscles to anchor, and counterbalances them when they contract. Animals with a notochord are called chordates. They also have a hollow nerve cord that runs along the top of the body. Gill slits and a tail are two other chordate features. Many modern chordates have some of these structures only as embryos. Choices: - limbic system - endoderm - mitochondria - notochord A:
A: notochord