Q: Q: Natural selection cannot create new variations in organisms - these new variations must be created by what, which are usually associated with some sort of abnormality? Read this paragraph and choose the correct option from the provided answers: Introduction All life on Earth is related. Evolutionary theory states that humans, beetles, plants, and bacteria all share a common ancestor, but that millions of years of evolution have shaped each of these organisms into the forms seen today. Scientists consider evolution a key concept to understanding life. Natural selection is one of the most dominant evolutionary forces. Natural selection acts to promote traits and behaviors that increase an organism's chances of survival and reproduction, while eliminating those traits and behaviors that are to the organism's detriment. But natural selection can only, as its name implies, selectit cannot create. The introduction of novel traits and behaviors falls on the shoulders of another evolutionary forcemutation. Mutation and other sources of variation among individuals, as well as the evolutionary forces that act upon them, alter populations and species. This combination of processes has led to the world of life we see today. Choices: - radiation - infection - pollution - mutation A:
A: mutation

Q: Q: What is the hardest of all minerals? Read this paragraph and choose the correct option from the provided answers: Diamonds like the one pictured in the Figure below are the hardest of all minerals. Is a diamond a crystalline or an amorphous solid? How do you know?. Choices: - titanium - gold - platinum - diamonds A:
A: diamonds

Q: Q: Partially decayed remains of plants and animals form the organic portion of what? Read this paragraph and choose the correct option from the provided answers: the partially decayed remains of plants and animals that forms the organic portion of soil. Choices: - minerals - nutrients - grasses - soil A:
A: soil

Q: Q: What do you call any substance that opposes coagulation? Read this paragraph and choose the correct option from the provided answers: Plasma Anticoagulants An anticoagulant is any substance that opposes coagulation. Several circulating plasma anticoagulants play a role in limiting the coagulation process to the region of injury and restoring a normal, clot-free condition of blood. For instance, a cluster of proteins collectively referred to as the protein C system inactivates clotting factors involved in the intrinsic pathway. TFPI (tissue factor pathway inhibitor) inhibits the conversion of the inactive factor VII to the active form in the extrinsic pathway. Antithrombin inactivates factor X and opposes the conversion of prothrombin (factor II) to thrombin in the common pathway. And as noted earlier, basophils release heparin, a short-acting anticoagulant that also opposes prothrombin. Heparin is also found on the surfaces of cells lining the blood vessels. A pharmaceutical form of heparin is often administered therapeutically, for example, in surgical patients at risk for blood clots. Choices: - dissolvent - antibodies - toxin - anticoagulant A:
A: anticoagulant