Answer the following question given this paragraph: Evolution of Birds The evolutionary history of birds is still somewhat unclear. Due to the fragility of bird bones, they do not fossilize as well as other vertebrates. Birds are diapsids, meaning they have two fenestrations or openings in their skulls. Birds belong to a group of diapsids called the archosaurs, which also includes crocodiles and dinosaurs. It is commonly accepted that birds evolved from dinosaurs. Dinosaurs (including birds) are further subdivided into two groups, the Saurischia ("lizard like") and the Ornithischia ("bird like"). Despite the names of these groups, it was not the bird-like dinosaurs that gave rise to modern birds. Rather, Saurischia diverged into two groups: One included the long-necked herbivorous dinosaurs, such as Apatosaurus. The second group, bipedal predators called theropods, includes birds. This course of evolution is suggested by similarities between theropod. Q: Birds belong to a group of diapsids called the what? Choices: - conifers - mammals - aviators - archosaurs A:
archosaurs
(Question)
Answer the following question given this paragraph: Vaporization is easily confused with evaporation, but the two processes are not the same. Evaporation also changes a liquid to a gas, but it doesn't involve boiling. Instead, evaporation occurs when particles at the surface of a liquid gain enough energy to escape into the air. This happens without the liquid becoming hot enough to boil. Q: What process changes a liquid to a gas without boiling? Choices: - absorption - melting - bubbling - evaporation A:
(Answer)
evaporation
Ques: Answer the following question given this paragraph: A headache is a very common nervous system problem. Headaches may be a symptom of serious diseases, but they are more commonly due to muscle tension. A tension headache occurs when muscles in the shoulders, neck, and head become too tense. This often happens when people are "stressed out. " Just trying to relax may help relieve this type of headache. Mild pain relievers such as ibuprofen may also help. Q: What common ailment is typically caused by tense muscles in the shoulders, head and neck? Choices: - disturbances - fever - pollution - headache A:
Ans: headache
(Q).
Answer the following question given this paragraph: Salamanders are found in most moist or arid habitats in the Northern Hemisphere, but can also be found south of the equator. They live on all continents except Antarctica and Australia. Salamanders live in or near water or on moist ground, often in a swamp. Some species live in water most of their life, some live their entire adult life on land, and some live in both habitats. Some salamanders live in caves. These salamanders have pale skin and reduced eyes as they have adapted to living in complete darkness in underground pools of water. The reduced eyes are similar to other organisms that live in caves or underground. Q: Pale skin and reduced eyes in salamanders that live in dark caves are an example of what? Choices: - interpretation - reproduction - expansion - adaptations A:
(A).
adaptations
Ques:Answer the following question given this paragraph: Can Snail Venom Be Used as a Pharmacological Painkiller? Marine snails of the genus Conus (Figure 28.25) attack prey with a venomous sting. The toxin released, known as conotoxin, is a peptide with internal disulfide linkages. Conotoxins can bring about paralysis in humans, indicating that this toxin attacks neurological targets. Some conotoxins have been shown to block neuronal ion channels. These findings have led researchers to study conotoxins for possible medical applications. Conotoxins are an exciting area of potential pharmacological development, since these peptides may be possibly modified and used in specific medical conditions to inhibit the activity of specific neurons. For example, these toxins may be used to induce paralysis in muscles in specific health applications, similar to the use of botulinum toxin. Since the entire spectrum of conotoxins, as well as their mechanisms of action, are not completely known, the study of their potential applications is still in its infancy. Most research to date has focused on their use to treat neurological diseases. They have also shown some efficacy in relieving chronic pain, and the pain associated with conditions like sciatica and shingles. The study and use of biotoxinstoxins derived from living organismsare an excellent example of the application of biological science to modern medicine. Q: Conotoxins released by certain marine snails can bring about paralysis in humans, indicating that this toxin attacks what system? Choices: - cerebral - circulatory - cardiovascular - neurological A:

Ans:neurological
Answer the following question given this paragraph: When HCl is dissolved into water, it is called hydrochloric acid. Ionic compounds and some polar compounds are completely broken apart into ions and thus conduct a current very well. A strong electrolyte is a solution in which a large fraction of the dissolved solute exists as ions. Q: Hydrochloric acid is formed when hcl is dissolved into what? Choices: - blood - sodium - plasma - water A:
water