Cell membranes are structured so that molecules can pass in and out of the cell across them. while both plant and animal cells have membranes, plant cells also have cell walls surrounding their cells. which of the following observations best supports the conclusion that molecules can cross cell walls as well? every cell has its own nucleus. the chloroplasts need light in order to work. the cell wall is directly outside the cell membrane. water from the soil is used in photosynthesis.

As a small change in a person's dna can cause a genetic disorder

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?

In which way are mercury and venus similar? they both rotate from east to west. they are both small and rocky. they both have thick atmospheres. they both are similar to earth in structure.