Q: What is the name of the muscle that contracts to cause the joint to straighten? Read this paragraph and choose the correct option from the provided answers: Muscles can only contract. They cannot actively extend, though they can move or relax back into the non-contracted neutral position. Therefore, to move bones in opposite directions, pairs of muscles must work in opposition. Each muscle in the pair works against the other to move bones at the joints of the body. The muscle that contracts to cause a joint to bend is called the flexor . The muscle that contracts to cause the joint to straighten is called the extensor . When one muscle is contracted, the other muscle from the pair is always elongated. Choices: - flexor - abductor - opposing - extensor A:
extensor

(Question)
Q: What is contained in the skin of brightly colored poison dart frogs? Read this paragraph and choose the correct option from the provided answers: Adrian Pingstone (Wikimedia: Arpingstone). Brightly colored poison dart frogs have toxins in their skin . Public Domain. Choices: - spores - acid - poison - toxins A:
(Answer)
toxins

Ques: Q: Opportunistic diseases are usually the direct cause of death of people with what disease? Read this paragraph and choose the correct option from the provided answers: boundary between air masses that is stalled in one place. Choices: - heart - parkinson - liver - aids A:
Ans: aids

(Q).
Q: Zinc is what kind of metal.? Read this paragraph and choose the correct option from the provided answers: Figure 18.7 Zinc is an active transition metal. It dissolves in hydrochloric acid, forming a solution of colorless Zn 2+ ions, Cl ions, and hydrogen gas. Choices: - active flow metal - active move metal - passive stagnant metal - active transition metal A:
(A).
active transition metal

Ques:Q: What basic structures are the site of all the life functions of an organism? Read this paragraph and choose the correct option from the provided answers: all the life functions of an organism occur within cells,. Choices: - lipids - proteins - genes - cells A:

Ans:cells

Q: In arthropods, coxal glands and malphigian tubules perform what role? Read this paragraph and choose the correct option from the provided answers: Some arthropods have special excretory structures. They are called coxal glands and Malphigian tubules. Coxal glands collect and concentrate liquid waste from blood. They excrete the waste from the body through a pore. Malphigian tubules carry waste from the digestive tract to the anus. The waste is excreted through the anus. Choices: - ingestion - reproduction - photosynthesis - excretion A:
excretion