Please help me with my work???

What is called the "building block" of life?

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?

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal