Look at the organisms in the image above. Which of the following organisms are most closely related evolutionarily? A.
starfish and sand dollar
B.
fish and starfish
C.
fish and clam
D.
crab and starfish

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

The table above shows five different types of chromosomal abnormalities that can occur during meiosis. they result in either an individual having too many or too few chromosomes in their genome. what is the most likely cause of these chromosomal abnormalities?