Which of the following are photosynthetic organisms?

select one or more:
a. algae
b. mushrooms
c. lichens
d. nitrogen-fixing bacteria

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

Forensic scientists think they know the identity of a skeleton. what rule should they use to select a relative whose dna could be used to try to confirm the identity?

Choose the best definition of allele. a. one of several possible versions of a gene, which each produce a different phenotype b. an organism that's purebred for a given trait c. the process of fertilizing a plant with pollen from another plant d. a set of genes that are located on the same chromosome and so are tightly linked