Answer: (A) The conclusion is valid because the independent and dependent variables in experiment were controlled.
Explanation: There are some basics requirements in order for an experiment to be valid: hypothesis, monitoring, independent and dependent variables and constants.
Answer:
the decomposer can break down a bad air that can make everyone fell sicl
Answer:
C
Explanation:
they both go through incomplete metamorphosis so they will both develop as a nymph
B, because it's not an advantage for something to be expensive and time consuming