Only 3 question 6. 100% of the energy that comes into an ecosystem comes in at the level of the which gets its energy from the sun to make its own food by photosynthesis. 7. energy in an ecosystem is lost at a rate of % per trophic level a. 10% b. 25% c. 50% d. 75% e. 90% 8. at which trophic level would you find the least # of organisms a. producer b. tertiary consumer c. secondary consumer

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously

Plz ! what does it mean for an allele to be dominant?