Answer:
C. cytosine and guanine
Explanation:
A.estrogen and testosterone - estrogen and testosterone are found in many mammals, but are not found in, for example, plants or bacteria.
B.hemoglobin and lymphocytes - hemoglobin is a protein found in a red blood cells. Lymphocytes white blood cells Again, they are found in organisms with closed circulatory systems and immune systems, but not simple organisms such as insects.
C. cytosine and guanine - these are the building blocks of DNA, which is a component in all living cells. Therefore, they are found in all living organisms
D.cellulose and chlorophyll - cellulose and chlorophyll are specific to plant cells.
The effects that silt runoff has on coral reefs would be C. It damages reefs by blocking sunlight and burying the reefs.
We know that it wouldn't be A or D because the problem mentions in the first chunk that reef conditions are not improving, leaving us with the choice of B or C. From the second chunk of text, we learn that the algae that polyps rely on is dependent on the sunlight and that the coral needs non-stagnant, or moving, water to stay alive. This is addressed by C, while B mentions something non-related to the question.
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Answer:
Physical adaptations do not develop during an individual animal's life, but over many generations. The shape of a bird's beak, the color of a mammal's fur, the thickness or thinness of the fur, the shape of the nose or ears are all examples of physical adaptations which help different animals survive.
When this occurs the neutrons released by a fission reaction continue striking more nuclei. If the fuel rods in a reactor vessel produce too much heat, this condition may occur.