Answer:
B
Explanation: Animal cells have a nucleus and plant and bacterial cells don't
Cellular organizations
reproduction
metabolism
homeostasis
heredity
response to stimuli
growth and development
adaptation through evolution
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Answer: humoral immune response
The main antibody isotypes in the influenza-specific humoral immune response are IgA, IgM and IgG. Mucosal or secretory IgA antibodies are produced locally and transported along the mucus of the respiratory tract by transepithelial transport and can afford local protection from infection of airway epithelial cells.
Answer:
Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
Science is our knowledge of the natural world and the process through which that knowledge is built. This body of knowledge consists of information gathered over thousands of years and is the result of observation, inquiry, rational thinking, and questioning. It has developed from group efforts and individual discoveries.