Sponges have no “true tissues.” what does this mean?
select one of the options below as your
a. they perform body functions by diffusion.
b. they have organs for specific functions.
c. similar cells do not cooperate together.

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?