Answer the following question given this paragraph: Galaxies are divided into three types, according to shape. There are spiral galaxies, elliptical galaxies, and irregular galaxies. Spiral galaxies are a rotating disk of stars and dust. In the center is a dense bulge of material. Several arms spiral out from the center. Spiral galaxies have lots of gas and dust and many young stars. Figure below shows a spiral galaxy from the side. You can see the disk and central bulge. Q: How many types of galaxies are there? Choices: - one - five - two - three A:
three
(Question)
Answer the following question given this paragraph: The cell wall is located outside the cell membrane. It consists mainly of cellulose and may also contain lignin , which makes it more rigid. The cell wall shapes, supports, and protects the cell. It prevents the cell from absorbing too much water and bursting. It also keeps large, damaging molecules out of the cell. Q: What shapes, supports, and protects the cell? Choices: - the epithelium - the mesothelium - the chloroplast - the cell wall A:
(Answer)
the cell wall
Ques: Answer the following question given this paragraph: People with osteoporosis have an increased risk of bone fractures. A bone fracture is a crack or break in bone. Even if you have healthy bones, you may fracture a bone if too much stress is placed on it. This could happen in a car crash or while playing a sport. Wearing a seatbelt when you ride in a motor vehicle and wearing safety gear when you play sports may help prevent bone fractures. Q: People with osteoporosis have an increase risk of what? Choices: - cancer - muscle loss - weight loss - bone fractures A:
Ans: bone fractures
(Q).
Answer the following question given this paragraph: Like all organisms, plants detect and respond to stimuli in their environment. Unlike animals, plants can't run, fly, or swim toward food or away from danger. They are usually rooted to the soil. Instead, a plant's primary means of response is to change how it is growing. Plants also don't have a nervous system to control their responses. Instead, their responses are generally controlled by hormones , which are chemical messenger molecules. Q: Instead of a nervous system, plant responses are generally controlled by what type of molecules, which serves as chemical messengers? Choices: - receptors - enzymes - sugars - hormones A:
(A).
hormones
Ques:Answer the following question given this paragraph: 13 Photosynthesis 6 CO2 + 6 H2 O C6 H12 O6 + 6 O2 One of most important reactions in history of life: source of atmospheric O2 ultimately led to aerobic respiration and eukaryotes Responsible for bulk of glucose production Early experiments showed that mass of plant must be derived from substances in the air, not the soil Experiments with isotopes showed that liberated oxygen comes from water Experiments also showed that light is essential but that some reactions (e. , reduction of CO2 ) continue in the dark Plants do two big, important things during photosynthesis: gain energy (absorb light) and build sugar (glucose). Photosynthesis can be divided into two series of chemical reactions: the light (lightdependent) reactions and the dark (light-independent) reactions. In light reactions, light is absorbed; in dark reactions, sugar is built. Occurs when plants, algae, and autotrophic bacteria absorb light energy and build glucose. Q: What is the process by which plants gain energy and produce sugar? Choices: - glycolysis - respiration - chemosynthesis - photosynthesis A:

Ans:photosynthesis
Ques:Answer the following question given this paragraph: All waves are the way energy travels through matter. Ocean waves are energy traveling through water. They form when wind blows over the surface of the ocean. Wind energy is transferred to the sea surface. Then, the energy is carried through the water by the waves. Figure below shows ocean waves crashing against rocks on a shore. They pound away at the rocks and anything else they strike. Q: All waves are the way energy travels through what? Choices: - time - vacuums - space - matter A:

Ans:
matter