All living things need carbon. how does carbon enter the living portion of an ecosystem?

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

In 2001, records showed that local stocks of fish were down worldwide. yet, records of harvests indicated that fish were being taken at records rates. what was actually happening?

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates