All of the following were likely present on the early Earth during the evolution of self-replicating molecules except

amino acids

nucleotides

lipids

free oxygen

Which genetic disorder is the result of a deletion of a section of an individuals chromosome?

What is a spinal cord

Eukaryotes do have (a)

How long can a person live without food and drinking only water?

The two basic and opposite actions that account for all muscle movements are contraction and extension. true or false

A scientist was studying a population of elephants. The first year, he counted a population of 80. Over the next eight years, the population's numbers were 94, 100, 103, 110, 125, 120, 125, 120. The population never exceeded 125.

When charles darwin set sail on his five-year journey on the hms beagle, both he and most of his contemporary scientists thought that each species was specially created by god in its present form and did not change over time.

Was Durer Roman Catholic or Protestant?

What is climate? How does climate change affect ecosystems?

Which of the following best describes the dust gas and celestial bodies of the Milky Way galaxy