Which category are consumers usually classified by?

Which allele combination represein a dihybrid cross for round and yellow seeds (rryy x rryy), what is the probability of having green and wrinkled seeds? nts a male who has an x-linked recessive disorder? which allele combination represents a male who has an x-linked recessive disorder?

Depending on the organism the number of in a cell may change

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important