Asap! 20 points! in an experiment to test the hypothesis that added phosphate will cause marigolds to produce more blooms, the experiments has two groups of pots planted with marigold seeds. one group gets watered with no phosphate. both groups get the same amount of water and light. which is a controlled variable in this experiment? a) numbers of pots b) amount of water c) amount of phosphate d) amount of blooms on a plant

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

Which could be a pathway of food through an ecosystem

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law