A food web refers to the graphical or pictorial representation of the food consumption interconnections among living organisms in a particular ecosystem. The food web usually have a base, a middle section and a top section. The base of the food web is made up of plants, which are called the producers. Plants are able to make their own food and others in the web depend on them for food. The middle section is made up of primary consumers, which are those organisms that feed directly on plants while the top section is made up of secondary consumers, which are those that feed on primary consumers.
Hershey and Chase studied bacteriophages which are viruses that attack bacteria. They labeled the bacteriophage with radioactive isotopes to see where it goes when a virus attacks. They discovered that nearly all the radioactivity was found in phosphorus, confirming that DNA contains genetic material, not protein.
Answer:
The pic on the right is a solar eclipse and the one on the left is a lunar eclipse. Lunar eclipse only happens when the sun and moon are directly aligned in front of the sun. A lunar eclipse occurs when the Moon moves into the Earth's shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned with Earth between the other two, and only on the night of a full moon.
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