Ques: Q: What type of thin lava forms shapes and tubes as it flows? Read this paragraph and choose the correct option from the provided answers: Pahoehoe lava is thinner than a'a, and flows more readily. Its surface looks more wrinkly and smooth. Pahoehoe lava flows in a series of lobes that form strange twisted shapes and natural rock sculptures ( Figure below ). Pahoehoe lava can form lava tubes. The outer layer of the lava flow cools and solidifies. The inner part of the flow remains fluid. The fluid lava flows through and leaves behind a tube ( Figure below ). Choices: - spicule - xeric - xerophyte - pahoehoe A:
Ans: pahoehoe

Ques: Q: Some fish will be over-fished to the point that their species ceases to exist, which is also known as what? Read this paragraph and choose the correct option from the provided answers: will inevitably make it more difficult and costly to grow food. The world's growing human population faces significant challenges in the increasing costs and other difficulties associated with producing food. Wild Food Sources In addition to growing crops and raising food animals, humans obtain food resources from wild populations, primarily wild fish populations. For about one billion people, aquatic resources provide the main source of animal protein. But since 1990, production from global fisheries has declined. Despite considerable effort, few fisheries on Earth are managed sustainability. Fishery extinctions rarely lead to complete extinction of the harvested species, but rather to a radical restructuring of the marine ecosystem in which a dominant species is so over-harvested that it becomes a minor player, ecologically. In addition to humans losing the food source, these alterations affect many other species in ways that are difficult or impossible to predict. The collapse of fisheries has dramatic and long-lasting effects on local human populations that work in the fishery. In addition, the loss of an inexpensive protein source to populations that cannot afford to replace it will increase the cost of living and limit societies in other ways. In general, the fish taken from fisheries have shifted to smaller species and the larger species are overfished. The ultimate outcome could clearly be the loss of aquatic systems as food sources. Choices: - endangered - accumulation - abundance - extinction A:
Ans: extinction

Ques: Q: What do you call a species that has died out in the past? Read this paragraph and choose the correct option from the provided answers: Life is complex, and there are millions of species alive today. Many millions more lived in the past and then went extinct. Organisms include microscopic, single-celled organisms. They also include complex, multicellular animals such as you. Clearly, life science is a huge science. That's why a life scientist usually specializes in just one field within life science. Dr. Smith, for example, specializes in ecology. You can see the focus of ecology and several other life science fields in Table below . Click on the links provided if you want to learn about careers in these fields. Choices: - endangered - inhabit - remnant - extinct A:
Ans: extinct

Ques: Q: Radioisotopes may vary greatly in their rate of decay, decaying faster if their nuclei are more what? Read this paragraph and choose the correct option from the provided answers: Different radioisotopes may vary greatly in their rate of decay. The more unstable their nuclei are, the faster they decay. Choices: - mature - immature - stable - unstable A:
Ans:
unstable