Plant growth substances stimulate root growth from a cut stem. Describe an investigation to find the best concentration of plant growth substance to stimulate root growth.
You should include experimental details in your answer and write in full sentences.

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

What molecule does hemoglobin decay into over time

Which of the following words best matches this definition: the process in which the best adapted organisms survive and pass on their traits, while those that are not well adapted do not survive to pass on their traits. question 3 options: acquired selection natural selection artificial selection organic selection