Select the correct answer from each drop-down menu. What challenges do investigators face when conducting a scientific inquiry?

Scientific inquiry is not easy to implement because of several factors. One of the problems is taking into consideration all the 1) and deciding which ones to standardize. Another problem investigators face doing experimentation lies in 2) the evidence.

ANSWER OPTIONS:

1.

A) data
B) variables
C) observations

2.

A) collecting
B) observing
C) interpreting

i think for the first one is b and the second one is c

Explanation:

i think its the first one

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."