which statement explains why oxygen molecules easily diffuse across a cell membrane while dna molecules do not?  a. dna molecules contain carbon atoms, while oxygen molecules have only oxygen atoms.  b. dna molecules have phosphate groups that the cell membrane repels.  c. oxygen molecules are very small, while dna molecules are very large.  d. oxygen molecules are more useful to a cell than are dna molecules.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

that is wrong, its not thymus.

the correct answer in apex is tissue development, i know because i just had this question