When does heart tissue first form in a human? A. During the first trimester of pregnancy B. During birth C. During the third trimester of pregnancy D. During the second trimester of pregnancy

The genetic information about particular biological traits encoded in an organism's dna is called the

Overall, membranes seem to have a great deal in common, but on closer inspection it is revealed that membranes of different cells have unique properties.

Ardipithecus ramidus had a small, chimpanzee-like body that was adapted to which condition? a. the heat b. the cold c. the water d. the trees

Human induced enviremental changes can affect living things at which levels

Give an example of how organisms in the biosphere contribute to the carbon cycle

Which route represents the path taken by the European explorer Christopher Columbus? A) 1 B) 2 C) 3 D) 4

Which gas is the most abundant of the trace gases? A. nitrogen B. oxygen C. argon D. carbon dioxide

Describe the central dogma of molecular biology, briefly describe the processes of transcription and translation.

magine that the animal body produced sperm and eggs with mitosis instead of meiosis. What chromosome number would the autosomes of the third generation have if the first generation had four chromosomes

A well supported testable explanation of phenomena that have occurred in the natural world is called