After reading the latest issue of organic compost quarterly, michael, brad and darius have decided to investigate the effect of fish sticks on plant growth. they plan on thawing fish sticks and then aging them for various lengths of time before using them as compost to promote the growth of eggplants. because decomposition is necessary for release of nutrients, the alexs’ hypothesized that older fish stick compost will produce taller eggplants. michael, brad and darius will grow four flats of eggplants (25 plants/flat) for 5 days. the eggplants will then be fertilized as follows: flat a: 450 g of 3-month-old fish stick compost flat b: 450 g of 6-month-old fish stick compost flat c: 450 g of 12-month-old fish stick compost flat d: 0 g of fish stick compost the eggplants received the same amount of sunlight and water each day. at the end of 30 days the students will record the height of the plants (cm) and then throw a party featuring fish sticks. identify the parts of this experiment. 1. constant 2. independent variable 3. hypothesis 4. dependent variable a. length of time of fish stick aging b. growth of the eggplant c. 5 days d. older fish stick compost will produce taller eggplants

A constant in any experiment is a variable that remains constant for the entire experiment, this constant helps to identify the other variables of the experiment and come to a conclusion. Here, in this experiment the number of days remains constant for the entire experiment which is 5 days as given in the options. Along with that the type of the plant, water amount, sunlight, 30 days of the whole experiment, and the number of plants remains the same for the entire experiment.

In the experiment the independent variable is the length of the old fish sticks aging , as per the study done by the experimenters the age of the old sticks will produce more compost which will result into taller eggplants. This will be independent of other variables in the experiment, as the decomposition of the fish sticks will be increased by everyday and the quality of the compost will also increase according to it, which will also produce taller eggplants. Here, the independent variables are 3, 6, 12 months .

The experiment which is considered for proving the hypothesis is that older fish sticks will give good quality of compost that will result into high production of taller eggplants. This will be supported by the experimental results by different individuals.

The growth of eggplant is the dependent variable in this experiment as it will be greatly influenced by other variables of the experiment. The variable which depends on other factors of experiment is called as the dependent variable. Here, in this case the height i.e. growth  of th eggplant is the dependent variable which will be the result of other varying factors of the controlled experiment.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

the answer for sodium is 0.186

the answer for rubidium is 0.251