Which of the following is a density-independent limiting factor?

A. earthquake

B. emigration

C. parasitism

D. disease

Explain why the soil doesn't qualify as an organism despite containing billions of living cells

Which of the following is an example of polygenic inheritance? A) pink flowers in snapdragons B) the ABO blood group in humans C) Huntington's disease in humans D) white and purple flower color in peas E) skin pigmentation in humans

The diagram shows the life cycle of a fern. Which labels belong in the areas marked 1 and 3?

Who first recognized the cell as the universal unit of life?

Which of the following macromolecules consist of long chains of amino acids? O A. Lipids O B. Proteins O C. Carbohydrates D. Nucleic acids

Which macromolecule includes steroids? a. lipids b. proteins c. carbohydrates d. nucleic acids?

The diploid cell created by the joining of conifer sex cells produces a (n): a. Zygote c. Bryophyte b. Megaspore d. Angiosperm

Which is a leading theory for the formation of fossil fuels?

Allele segregation and gamete formation one character in peas that mendel studied was yellow versus green seeds.

A 14 month old child returns from surgery for an undescended testicle. when planning for the child's discharge, the nurse should remind the parents to observe their child for