State the null hypothesis for: An experiment testing whether echinacea decreases the length of colds. A correlational study on the relationship between brain size and intelligence. An investigation of whether a self-proclaimed psychic can predict the outcome of a coin flip. A study comparing a drug with a placebo on the amount of pain relief. (A one-tailed test was used.)

Johannesburg kepler, an apprentice of brahe, believed in the heliocentric universe but rejected past astronomers belief in

The first three phases of the cell cycle are collectively known as (1 point) play audio cellular respiration. telophase. mitosis. interphase.

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?