Ques: Q: What do scientists use to study the deep without going to the seafloor? Read this paragraph and choose the correct option from the provided answers: Sending humans to the seafloor is expensive and dangerous. Having to return humans safely to the surface limits what a mission can do. Remotely operated vehicles , or ROVs, allow scientists to study the deep without going to the seafloor. These small vehicles carry cameras and scientific instruments. ROVs were used to study inside the Titanic . This would have been far too dangerous for a manned sub to enter. Scientists control ROVs electronically with sophisticated operating systems. Choices: - drill rigs - telescopes - ultrasound machines - remotely operated vehicles A:
Ans: remotely operated vehicles

Ques: Q: In contrast to mammals and birds, freshwater fishes produce large volumes of very dilute what? Read this paragraph and choose the correct option from the provided answers: Choices: - nitrogen - feces - blood - urine A:
Ans: urine

Ques: Q: Which part of the wave helps make the wave bend and cause refraction? Read this paragraph and choose the correct option from the provided answers: Lymph that collects in tissues slowly passes into tiny lymph vessels. Lymph then travels from smaller to larger lymph vessels. Muscles around the lymph vessels contract and squeeze the lymph through the vessels. The lymph vessels also contract to help move the lymph along. Eventually, lymph reaches the main lymph vessels, which are located in the chest. From these vessels, lymph drains into two large veins of the cardiovascular system. This is how lymph returns to the blood. Choices: - dense part - heavy part - bright part - shallow part A:
Ans: shallow part

Ques: Q: Lymphatic capillaries are interlaced with the arterioles and venules of which system? Read this paragraph and choose the correct option from the provided answers: Figure 21.3 Lymphatic Capillaries Lymphatic capillaries are interlaced with the arterioles and venules of the cardiovascular system. Collagen fibers anchor a lymphatic capillary in the tissue (inset). Interstitial fluid slips through spaces between the overlapping endothelial cells that compose the lymphatic capillary. Choices: - skeletal systems - circulatory system - atmospheric system - cardiovascular system A:
Ans:
cardiovascular system