Tecnological solutions have good and bad effects .what is a bad effect of spraying a chemical pesticide on crops
a. it is dangerous to humans
b. it kills all insect pests
c. it is expensive
d. it protests the food from damage

Turtle hatchling survivorship rate is low in many turtle species due to predation. amanda researched the predatory rate on a species of turtle eggs in the red river. the eggs were harvested from trapped turtles and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. research suggests that predators use the female's cloaca scent to locate the eggs. the eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. the nests were monitored by cameras and manually on foot and data on nest predation were recorded. a. based on the experimental design, what is the dependent variable? b. based on the experimental design, what is the independent variable? c. based on the experimental design, what is the control?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

In what for do plants utilize nitrogen? why do they need nitrogen?