The plasma membrane is a good barrier because it has: A) cholesterol embedded within the bilayer to add rigidity to its structure
B) proteins that adhere to cytoskeleton fibers to help anchor the cell in place.
C) fatty acid tails within the lipid bilayer that create a
hydrophobic region making it difficult for polar molecules to pass through
D) proteins embedded within the bilayer to keep substances out
E) polar head groups at the surface of the lipid bilayer that
create a hydrophilic region making it difficult for charged
molecules to pass through

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards. the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus