Which of the following statements is true? A) introns have complementary sequences in DNA but will be cut out because they are irrelevant B) During RNA splicing, the Exons are removed C) an exon is part of an intron D) an initial mRNA transcript is no longer than the gene from which the molecule was transcribed

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down