Karl Rudolphi and J. H.F. Link proved plant cells had independent cell walls. why is this discovery relevant to the Cell Theory?

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

Which of the following would involve looking at different structures of organisms and comparing how similar they are? a. vestigial structuresb. radiometric datingc. homologous structures

Where is having brightly colored feathers that attract mates most clearly an adaptation for a bird? a. a forest with dense vegetation b. a sandy beach beside an ocean c. a snowy tundra with little vegetation d. a swamp with many hawks that eat birds