What are the five main barriers to block pathogens? *?

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

The lineage of pea plants produced round seeds for four generations. the plants that fertilized these pea plants also produced round seeds. however, in the fifth generation, the plant produced to two plants with wrinkled seeds. can that be possible?

This diagram shows how seed plants are grouped. which is the missing label? bryophytes angiosperms pteridophytes monocots