How would genetically engineered fish effect society

Which element provides strength to the exoskeleton of clams and oysters

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

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?