Which characteristic is necessary for natural

selection to occur in a species?

(1) stability

(2) variation

(3) complex cellular organization

(4) a very low mutation rate

1. Which of these is not classified as an organism? kidney tree? lizard protozoa 2. Which domain consists mainly of organisms made up of many cells? Archaea and eukarya Bacteria and eukarya Only eukarya Only bacteria

When comparing tissue types it is important and compare these characteristics?

Which of these is the most important cause of adult onset epilepsy? neurocysticercosis neurotoxoplasmosis primary amoebic meningoencephalitis African trypanosomiasis

Which of the following gases was not believed to be present on earth at the time of its formation 4.6 billion years ago?

Which of the following does not require the release of a first messenger? Paracrine Signaling Electrical Synaptic Transmission Chemical Synaptic Transmission Autocrine Signalling

What must happen before the cell can go through mitosis? Interphase.

Belle's grandfather lives in a region where the temperature drops below 0*F at night. When belle visited her grandfather, they hiked up a hill. Belle noticed that a lot of rock had cracks in them.

The genetic condition of an organism that has two identical alleles for a given trait.

Which level of biological classification is the lowest level that butterflies

What might happen if a continent stops rifting apart?