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C. Just introduced
D. Very complicated
E. Very hard

7. Solar particles are hurled into space by …
A. Undetermined causes
B. Disturbances of wind
C. Small rivers on the surface of the sun
D. Changes in the Earth’s atmosphere
E. Interference in communication

8. What does the author mean by the statement, Actually, the sunspots are
cooler than the rest of the photosphere, which may account for their
apparently darker color?
A. Neither sunspots nor the photosphere is hot
B. Sunspots in the photosphere do not have any color
C. The color of sunspots could be affected by their temperature
D. The size of a sunspots affects its temperature
E. Either sunspots or the photosphere is not hot

The protozoans, minute aquatic creatures, each of which consists of a
single cell of protoplasm, constitute a classification of the most primitive forms
of a animal life. The very name protozoan indicates the scientific
understanding of the animals. Proto means first or primitive, and zoa refers
to animal. They are fantastically diverse, but three major groups may be
identified on the basis of their motility. The Mastigophora have one or more
long tails that they use to propel themselves forward. The Ciliata, which use
the same basic means for locomotion as the Mastigophora, have a larger
number of short tails. The Sarcodina, which include amoebae, float or row
themselves about on their crusted bodies.
In addition to their form of movement, several other features discriminate
among the three group of protozoans. For example, at least two nuclei per
cell have been identified in the Ciliata, usually a large nucleus that regulates
growth but decomposes during reproduction, and a smaller one that contains
the genetic code necessary to generate the large nucleus.
Chlorophyll, which is the green substance encountered in plants, is found
in the bodies of some protozoans, enabling them to make some of their own
food from water and carbon dioxide. Protozoans are not considered as plants
but animals, because unlike pigmented plants to which some protozoans are
otherwise almost identical, the do not live on simple organic compounds.
Their cell demonstrates all of the major characteristics of the cells of higher
animals, such as eating, breathing, and reproducing.
Many species of protozoans collect into colonies, physically connected to
one another and responding uniformly to outside stimulae. Current research
into this phenomenon along with investigations carried out with advanced
microscopes may necessitate a redefinition of what constitutes protozoans,
even calling into question the basic premise that they have only one cell.
Nevertheless with the current data available, almost 40,000 species of

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