1. why do scientists use the scientific method? to answer questions about the natural world to figure out how to run experiments to show people they are smart to collect data a student wants to determine the effect of a certain brand of liquid fertilizer on the growth of ivy. ivy plants of the same length are planted in the same amount of soil in three identical containers. to one container, 5 ml of the fertilizer is added; in the second container, 10 ml of the fertilizer is added; and in the third container no fertilizer is added. the containers are placed in front of the same window. the length of the ivy is measured every five days, and the observations are recorded in a data table. 2. what was the independent variable in this experiment? soil light fertilizer growth

1. to answer questions about the natural world

The aim of scientific method is to answer a question that the scientist have. To answer the question, the scientist need to design a research or observation. If the research is flawed, the result might not match with the scientist aim and the conclusion will be wrong. Scientific method can be used to help design the research so it will have less flaw

2. fertilizer

The student wants to determine the effect of a certain brand of liquid fertilizer on the growth of ivy. The fertilizer are hoped to influence the growth of the ivy. Independent variable is the variable that hoped to influence the dependent variable. So, the independent variable would be fertilizer and the dependent variable would be the growth.

the answer is d. none of the above

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.