Which organelle is labeled i? a) cell membrane b) ribosome c) endoplasmic reticulum d) nucleus

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

What pattern of migration do whales follow?

Which of the follow describes a disadvantage secondary sources have compared to primary sources?