T cells and B cells are similar because they both deal with fighting of viruses.
Answer: D. Ecologist
Explanation: an ecologist is someone who studies the interactions of different organisms. An ecologist would be a type of scientist who would most likely study the interactions of birds
21.69mL - 20.70mL = .99mL Fe
7.8 g / .99 mL = 7.9g/mL
22.7 liters
The molar volume of an ideal gas depends on the temperature and pressure. One mole of any ideal gas occupies 22.7 liters at 0 0C and 1 bar (STP).
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Pressure caused by high temperatures are balanced by gravity
