What is the main source of energy in a shady stream? O A. Phytoplankton
O B. Algal blooms
O C. Dead leaves
O D. Photosynthetic bacteria

Babies with very low or very high weight are less likely to survive .

Arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat. rank from first to last. do not overlap any tiles. view available hint(s) reset av nodeav bundleinternodal pathwaysbundle branchessa nodepurkinje fibers

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction