Answer the following question given this paragraph: Mutations are essential for evolution to occur because they increase genetic variation and the potential for individuals to differ. The majority of mutations are neutral in their effects on the organisms in which they occur. Beneficial mutations may become more common through natural selection. Harmful mutations may cause genetic disorders or cancer. Q: What phenomenon is essential in order for evolution to occur because it increases genetic variation and the potential for individuals to differ? Choices: - radiation - replication - natural selection - mutation A:
mutation
Answer the following question given this paragraph: There are two main types of fats, saturated and unsaturated. Q: Saturated and unsaturated are the two main kinds of what? Choices: - sugars - acids - polymers - fats A:
fats
Q: Answer the following question given this paragraph: Lifecycle of Leukocytes Most leukocytes have a relatively short lifespan, typically measured in hours or days. Production of all leukocytes begins in the bone marrow under the influence of CSFs and interleukins. Secondary production and maturation of lymphocytes occurs in specific regions of lymphatic tissue known as germinal centers. Lymphocytes are fully capable of mitosis and may produce clones of cells with identical properties. This capacity enables an individual to maintain immunity throughout life to many threats that have been encountered in the past. Q: Characterized by a short lifespan, what begin with production in the bone marrow under the influence of csfs and interleukins? Choices: - solutes - pathogens - erythrocytes - leukocytes A:
A: leukocytes
Question: Answer the following question given this paragraph: Nervous Tissues Nervous tissues are made of cells specialized to receive and transmit electrical impulses from specific areas of the body and to send them to specific locations in the body. The main cell of the nervous system is the neuron, illustrated in Figure. Q: What is the main type of cell in the nervous system called? Choices: - sensory - conduction - axon - neuron A:
Answer: neuron
*Question*
Answer the following question given this paragraph: The earliest fungi may have evolved about 600 million years ago. Q: How many years ago may the earliest fungi have evolved? Choices: - .350 million - 500 million - .250 million - 600 million A:
**Answer**
600 million
Answer the following question given this paragraph: Adulthood does not have a definite starting point. A person may be physically mature by age 16 or 17 but not defined as an adult by law until older ages. In the U. S. , you can't join the armed forces or vote until age 18. You can't buy or use alcohol or take on many legal and financial responsibilities until age 21. Q: What phase of a human life does not have a definite starting point? Choices: - adolescence - death - childhood - adulthood A:
adulthood