The setup shows four test tubes. Tube 1 contains water only. Tube 2 contains a live snail. Tube 3 contains a live green water plant. Tube 4 contains both a live green water plant and a live snail. We know that plants can photosynthesize. We also know the product of photosynthesis is the reactant of cellular respiration. In this setup, which tubes contains and organism(s) carrying on cellular respiration?

a) tubes 2 and 4, only
b) tubes 3 and 4, only
c) tubes 2, 3, and 4 only
d) tubes 1 and 2, only

pls help as fast as u can! <3

Chemisorption Upgrade, upgrades a physisorption only instrument to a ... 202-25849-00 Dewar, 3 liter, cold trap ... 004-25913-00 1/8 Peek Ferrule Set for sealing gas inlet lines into th gas inlet ... Operating Supplies and Replacement Parts ... 004-25465-00 O-ring, -010 Kalrez 7075, for sealing frit in sample tube port (for ...

Explanation:

i hope this helped

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

read more on -