The background rate of extinction for birds is estimated to be about 1 species every 400 years. The current estimate for actual loss during the last 800 years is somewhere between 200 and 2,000. Explain what exactly background extinction rate is and hypothesize at least two specific factors that are contributing to the current rate.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.