Which of the following organisms in the Gulf of Mexico experiences an immediate increase of population due to fertilizer runoff into the Mississippi River?

bacteria

phytoplankton

dolphins

fish

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic