A researcher wants to document the number of monarch butterflies that migrate througha specific area. Which statement describes a limitation the
researcher is likely to face?
OA Monarchs feed predominately on milkweed plants
OB. Some monarchs might be cOunted more than once
OC. Some monarchs die before they can migrate
D. Monarchs migrate during a specific time of vear

Ialready know the answers to these questions and they are on the attachment. but i just need to know why that answer is the correct one. plz asap! this is for a report that i need to email by 10!

Which is one example of a phenotypic change that is not genetic

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.