A(n) key is very easy to use because it provides only two choices. dichotomous answer monochotomous observation

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

What are the formed elements (cell or parts of cell) in blood and what are their functions ?