It's often impossible to repeat trials on the same subjects. 2-Subjects may report an inaccurate medical history. 3-It can be difficult to control all possible variables. 4-It's impossible to come up with testable scientific questions for human subjects.
Answer:
During photosynthesis, chemical energy is formed
Agriculture= Crops that are disease resistant, stay fresh longer, insect resistant and higher number of crops
Ferns<span>, </span>horsetails<span>, </span>mosses<span>, and </span><span>liverworts, flowers, mint</span>
Endocrine glands are responsible for <span>regulating body activities. The correct option among all the options that are given in the question is the second option or option "B". The endocrine system basically acts as long distance signalling system for the body. I hope that the answer has helped you.</span>
