Please help me with questions 1, 2, and 3. Thank you!  1) How will you distinguish a primary research article from a secondary source, like a review article or popular science article? 2) How can you know a publication is an academic journal rather than just a magazine?   3) Give an example of a physical variable and describe how it may affect plant growth.

I'm asking for help on the second portion that starts with "Identify whether each..." and the bullet points following it.

Friority Standard #2-Use the Scientific Method to desigh I Investigate a phenomena in biology. As an introductory lab in biology class, Mr. Schoder has you conduct an experiment to practice using the steps of the scientific method. Each group will be given 3 planting kits which include pots, sol and seeds. Students are going to plant their seeds and grow their plants for the first week. Once the first week has passed and the seeds have sprouted, groups are going to divide their planters into three groups, one group of plants will receive OmL of water per day. another will get Sml of water per day and the third will receive 10ml of water per day. Students will measure and record the height of the plants once a week for 6 weeks. During the experiment the students found that after the 6 week period the plant that received Oml of water died and had a height of Ocm. The plant that received 5ml of water per day reached a height of 50cm and the plant that was watered 10mL of water per day…

Q1: What is the correct answer choice?