Explain how trees can be produced and yet the smallest trophies level in a pyramid of numbers

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.