9. Danielle lives with her family on a farm. In school, she has been learning about the nitrogen cycle in science class. She knows that her father spread a nitrogen-based fertilizer on a patch of grass recently where the
Cows graze in the field. Why was it necessary to add a nitrogen-based fertilizer to the soil where there was a
patch of grass?
a. because nitrogen can only be "fixed" by lightning
b. because there are no decomposers on the farm
c. because bacteria released all of the nitrogen into the air
d. because plants cannot use "free" nitrogen

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.

If the dimensions of a cube-shaped cell with a length,height, and width of 1 micrometer were to double, what would be the cell's new ratio of surface area to volume? a.3 to 1 b.4 to 3 c.1 to 2 d1 to 6

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2