The results of Soil Type 3 in Experiment 2 and Pot Number 4 in Experiment 1 were almost identical. This is most likely because:
A. The same amount of compost was used.
B. The plants were allowed to grow for 2 more weeks.
C. The pots were the same size.
D. The same type of soil was used.

Experiment 1
The students dug a soil sample from an empty field next to the school. They put soil into 4 different clay pots, and mixed in various amounts of compost so that the volume of soil mixture was the same in each pot. They then planted the same number of radish seeds (4) in each pot. The soil/compost mixtures for each pot are shown in Table 1.

The clay pots were placed next to each other on a windowsill and watered at the same time each day. The students took care to ensure that the pots each received the same amount of sunlight and water each day. After 2 weeks, the students began recording the growth of the radish plants. They continued recording this data for two more weeks. The results are shown in Table 2.

Experiment 2
The students repeated Experiment 1, with the following changes; each pot contained a different soil type, and no compost was used. This experiment was begun at the same time as Experiment 1. The results of Experiment 2 are shown in Table 3.

Transcribed Image Text:

Soil/compost mixture (Pot #) 1 2 3 4 Table 1 % Soil/% compost 25%/75% 50%/50% 75%/25% 100% soil