9. Which substances contain nitrogen? (1 Point)
Carbohydrates and fats
Proteins and carbohydrates
Proteins
Proteins, carbohydrates and fats

i believe the correct answer is d

bc blah

explanation:

bc blah

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.