The diagram below represents the six pairs of homologous chromosomes in a cell of a fruit fly before exposure to radiation (top row) and after exposure to radiation (bottom row). the appearance of the chromosomes in b indicates that exposure to radiation has caused:

image

a.

crossing over

b.
segregation & recombination

c.

chromosomal mutations

d.
non-disjunction

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

Match the order of the levels of organization in nature with the correct description. example: atoms are fundamental units of matter= level 1levels- 2,3,4,5,6,7,8.now what levels are these? population consists of organismscells consist of moleculesecosystems consist of communities interacting with there environmentmolecules consist of atomsthe biosphere consist of all ecosystems on earthcommunities consists of populationorganisms consist of cells