What factor made evolution more very slowly for the first two billion years of life on earth?

Which sequence shows the correct path of urine through the excretory system?

A forest fire destroys an area. A small population of trees and a large population of birds are both affected. Which type of limiting factor causes this? a. density dependent b. density independent c. population dependent d. population independent

A student argues that two species of birds are the same species because they have similar body structures, similar DNA, and similar beaks.

When homologous chromosomes crossover, what occurs? A) Two chromatids get tangled, resulting in one re-sequencing its DNA. B) Two sister chromatids exchange identical pieces of DNA.

What is a similarity between alcohol fermentation and aerobic respiration

What is the junction between a nerve cell and another cell called: axon, synapse, dendrite, none of the above

1. Synthesize Information How do you explain to the horse owner why this foal was born with OLWS while two previous foals were perfectly healthy? What would you tell the new parents of the baby girl about their prospects for having more children?

What organelle is the control center for the cell and holds the DNA

The primary structure of a protein refers to the sequence of amino acids that are linked together in a long chain. Which of the following common items would best represent the primary structure of a protein? O A.

How many chromosomes do humans have? how many copies in normal cells? How many pairs? How many copies in sex cells?