Answer the following question given this paragraph: Many of the organisms that made up the Pleistocene megafauna went extinct as conditions warmed. Some may have been driven to extinction by human activities. Q: Warming conditions and, perhaps, human activities contributed to what fate of many organisms of the pleistocene era? Choices: - overpopulation - accumulation - evolution - extinction A:
extinction
Answer the following question given this paragraph: Thick fur and a layer of blubber keep polar bears warm in their Arctic ecosystem. Why do you think their fur is white? Why might it be an adaptation in an Arctic biome?. Q: What 2 things keep polar bears warm in their arctic ecosystem? Choices: - hibernation, thick fur - colourful fur , blubber - camouflage, blubber - thick fur, blubber A:
thick fur, blubber
Q: Answer the following question given this paragraph: Hot lower mantle material rises upward ( Figure below ). As it rises, it cools. At the top of the mantle it moves horizontally. Over time it becomes cool and dense enough that it sinks. Back at the bottom of the mantle, it travels horizontally. Eventually the material gets to the location where warm mantle material is rising. The rising and sinking of warm and cooler material is called convection . Q: What is the rising and sinking of warm and cooler material called? Choices: - depression - conveyance - diffusion - convection A:
A: convection
Question: Answer the following question given this paragraph: The first line of defense includes mechanical, chemical, and biological barriers. Q: The first line of defense includes mechanical, chemical, and which other barrier? Choices: - independent - physical - surgical - biological A:
Answer: biological
*Question*
Answer the following question given this paragraph: Mammals breathe with the help of a diaphragm . This is the large muscle that extends across the bottom of the chest below the lungs. When the diaphragm contracts, it increases the volume of the chest. This decreases pressure on the lungs and allows air to flow in. When the diaphragm relaxes, it decreases the volume of the chest. This increases pressure on the lungs and forces air out. Q: What is the large muscle that extends across the bottom of the chest below the lungs called? Choices: - uterus - pectoral - abdomen - diaphragm A:
**Answer**
diaphragm
(Q).
Answer the following question given this paragraph: Proteins are biochemical compounds that consist of one or more chains of small molecules called amino acids. Amino acids are the monomers of proteins. There are only about 20 different amino acids. The sequence of amino acids in chains and the number of chains in a protein determine the protein's shape. Shapes may be very complex. You can learn more about the shapes of proteins at this link:. Q: What is the name for biochemical compounds that consist of one or more chains of small molecules called amino acids? Choices: - lipids - protons - hormones - proteins A:
(A).
proteins