Answer the following question given this paragraph: In the first beaker, distilled water does not conduct a current because water is a molecular compound. In the second beaker, solid sodium chloride also does not conduct a current. Despite being ionic and thus composed of charges particles, the solid crystal lattice does not allow the ions to move between the electrodes. Mobile charged particles are required for the circuit to be complete and the light bulb to light up. In the third beaker, the NaCl has been dissolved into the distilled water. Now the crystal lattice has been broken apart and the individual positive and negative ions can move. Cations move to one electrode, while anions move to the other, allowing electricity to flow (see Figure below ). Melting an ionic compound also frees the ions to conduct a current. Ionic compounds conduct an electric current when melted or dissolved in water. Q: In the first beaker, distilled water does not conduct a current because water is a what? Choices: - pure element - solute - magnetic compound - molecular compound A:
molecular compound
(Question)
Answer the following question given this paragraph: Leaves may vary in size, shape, and their arrangement on stems. Nonflowering vascular plants have three basic types of leaves: microphylls ("tiny leaves"), fronds , and needles . Figure below describes each type. Q: Nonflowering vascular plants have how many basic types of leaves? Choices: - four - one - five - three A:
(Answer)
three
Ques: Answer the following question given this paragraph: neotropicum infects the ant Cephalotes atratus, leading to dramatic changes in the infected ant's morphology and behavior. The infected ant's abdomen turns red and is held raised up, which makes it resemble a fruit and increases the likelihood of the infected ant being eaten by birds (). The birds transport the worms, which survive in their digestive systems until they are excreted; they are then eaten by, and infect new ants to complete the worm's life cycle.78 Perhaps the most famous example of this type of behavior occurs in wasps of the family Ichneumonidae. Female wasps deposit their fertilized eggs into the bodies of various types of caterpillars. The wasp eggs hatch out and produce larvae which then feed on the living caterpillar, consuming it from the inside out. Charles Darwin, in a letter to the American naturalist Asa Gray, remarked "There seems to me too much misery in the world. I cannot persuade myself that a beneficent & omnipotent God would have designedly created the Ichneumonidae with the express intention of their feeding within the living bodies of caterpillars, or that a cat should play with mice. " Rather than presume that a supernatural creator was responsible for such apparently cruel behaviors, Darwin and others sought alternative, morally neutral naturalistic processes that could both generate biological diversity and explain biological behaviors. As the diversity of organisms became increasingly apparent and difficult to ignore, another broad and inescapable conclusion began to emerge from anatomical studies: many different organisms displayed remarkable structural similarities. For example, as naturalists characterized various types of animals, they found that they either had an internal skeleton (the vertebrates) or did not (the invertebrates). Comparative studies revealed that there were often many similarities between quite different types of organisms. A classic work, published in 1555, compared the skeletons of a human and a bird, both vertebrates.79 While many bones have... Q: Which infection turns ant's abdomen red and fruit-like and an easy prey for birds? Choices: - yeast - trichina - cocklebur - neotropicum A:
Ans: neotropicum
(Q).
Answer the following question given this paragraph: A warm-air heating system uses thermal energy to heat air. It then forces the warm air through a system of ducts. You can see a diagram of this type of heating system in Figure below . Typically, the air is heated in a furnace that burns natural gas or heating oil. When the air is warm, a fan blows it through the ducts and out through vents that are located in each room. Warm air blowing out of a vent moves across the room, pushing cold air out of the way. The cold air enters an intake vent on the opposite side of the room and returns to the furnace with the help of another fan. In the furnace, the cold air is heated, and the cycle repeats. Q: A warm-air heating system uses what kind of energy to heat air? Choices: - atmospheric - nuclear - cosmic - thermal A:
(A).
thermal
Ques:Answer the following question given this paragraph: Sometimes people with an allergy get allergy shots. They are injected with tiny amounts of the allergen that triggers the allergic reaction. The shots are repeated at regular intervals, and the amount of allergen that is injected each time gradually increases. How do you think this might help an allergy? Do you think this approach just treats allergy symptoms or might it cure the allergy?. Q: What type of shots do people with allergy get? Choices: - nasal shots - booster shots - flu shots - allergy shots A:

Ans:allergy shots
Ques:Answer the following question given this paragraph: Q: The science of analyzing tree rings is called what? Choices: - algorithms - conservation - estradiol - dendrochronology A:

Ans:
dendrochronology