Aresearcher is interested in the effects of nitrate and phosphate on plant growth and sets up an experiment in which groups of five plants are given 1, 2, and 3 grams of nitrate and 1, 2, and 3 grams of phosphate in all combinations over a period of one month. the researcher measures plant height and weight at the end of the experiment. what is missing in this experimental design?
question 9 options:
a control
an independent variable
a dependent variable
a constant
Answers: 2
Biology, 21.06.2019 18:30
Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.
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Humans have to eat food to get the nutrients that keep us alive, but plants use the sun to power photosynthesis
Answers: 2
Aresearcher is interested in the effects of nitrate and phosphate on plant growth and sets up an exp...
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