Apopulation ecologist determines the number of oak trees per square unit in a forest. what is he trying to infer by doing so?

Which of the following is not a major characteristic used to identify minerals? a. hardness c. density b. magnetism d. luster select the best answer from the choices provided a b c d i know it is not d

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

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