Answer the following question given this paragraph: All the atoms of a given element have the same number of protons in their nucleus, but they may have different numbers of neutrons. Atoms of the same element with different numbers of neutrons are called isotopes. Many elements have one or more isotopes that are radioactive. These isotopes are called radioisotopes . Their nuclei are unstable, so they break down, or decay, and emit radiation. Q: All the atoms of a given element have the same number of what in their nucleus, though they may have different numbers of neutrons? A:

OPTIONS:
- molecules
- electrons
- compounds
- protons

Answer: protons

Problem: OPTIONS:
- spontaneous mutation
- variation
- generation
- evolution
Q: Answer the following question given this paragraph: Evolution is a change in the characteristics of living things over time. Evolution occurs by a process called natural selection. In natural selection, some living things produce more offspring than others, so they pass more genes to the next generation than others do. Over many generations, this can lead to major changes in the characteristics of living things. Evolution explains how living things are changing today and how modern living things have descended from ancient life forms that no longer exist on Earth. Q: The change in the characteristics of living things over time is known as _________ A:
Answer: evolution

Problem:OPTIONS:
- the debris bowl
- the flow bowl
- the land bowl
- the dust bowl

Answer the following question given this paragraph: The Dust Bowl taught people that soil could be lost by plowing and growing crops. This led to the development of new ways of farming that help protect the soil. Some of the methods are described in Figure below . Q: What historical event taught people that soil could be lost by plowing and growing crops and encouraged new methods to prevent erosion? A:
****
A: the dust bowl

Answer the following question given this paragraph: The first organisms were made of only one cell ( Figure below ). The earliest cells were prokaryotes . Prokaryotic cells are surrounded by a cell membrane. They do not have a nucleus. Their organelles are free in the cell. The cells get their nutrients directly from the water they live in. The cells need to use these nutrients to live and grow. Q: The earliest cells were prokaryotes, surrounded by a cell membrane but lacking which key structure? A:
OPTIONS:
- mitochondria
- ribosomes
- lysosomes
- nucleus
nucleus

Answer the following question given this paragraph: Steps of Virus Infections A virus must use cell processes to replicate. The viral replication cycle can produce dramatic biochemical and structural changes in the host cell, which may cause cell damage. These changes, called cytopathic (causing cell damage) effects, can change cell functions or even destroy the cell. Some infected cells, such as those infected by the common cold virus known as rhinovirus, die through lysis (bursting) or apoptosis (programmed cell death or "cell suicide"), releasing all progeny virions at once. The symptoms of viral diseases result from the immune response to the virus, which attempts to control and eliminate the virus from the body, and from cell damage caused by the virus. Many animal viruses, such as HIV (human immunodeficiency virus), leave the infected cells of the immune system by a process known as budding, where virions leave the cell individually. During the budding process, the cell does not undergo lysis and is not immediately killed. However, the damage to the cells that the virus infects may make it impossible for the cells to function normally, even though the cells remain alive for a period of time. Most productive viral infections follow similar steps in the virus replication cycle: attachment, penetration, uncoating, replication, assembly, and release (Figure 21.8). Attachment A virus attaches to a specific receptor site on the host cell membrane through attachment proteins in the capsid or via glycoproteins embedded in the viral envelope. The specificity of this interaction determines the hostand the cells within the hostthat can be infected by a particular virus. This can be illustrated by thinking of several keys and several locks, where each key will fit only one specific lock. Q: Symptoms of viral diseases result from what kind of response to a virus? A:
OPTIONS:
- infection
- pathogenic
- mutation
- immune

Answer: immune

input with options: Answer the following question given this paragraph: Zinc reacting with hydrochloric acid produces bubbles of hydrogen gas. Q: Zinc reacting with hydrochloric acid produces bubbles of which gas? A:
OPTIONS:
- carbon
- helium
- mustard
- hydrogen
output:
hydrogen