How many characteristics are needed to prove something is alive?

Which of the following would not be considered a stage in speciation?

If all of the oxaloacetate (OAA) in the cell was consumed, say by an intracellular pathogen that eats OAA as its primary food source, how would it affect the activity of the Citric Acid Cycle?

Name two roles of parenchyma cells and briefly explain how these cells are specialized for these roles

What structural parts do chimpanzees and humans have in common?

By what process does nitrogen enter the living components of ecosystems?

What two substances are made in the nucleus and move into the cytoplasm?

Why did this happen

Complex chemical catalysts produced by living cells are enzymes.

A scientist is studying a gene known as the XYZ gene in eukaryotes. Into a eukaryotic cell, she inserts an miRNA that is complementary to a portion of the XYZ mRNA found in the cell. What result would you predict

A researcher is creating pedigrees for a trait he suspects to be dominant in humans. What are some of the likely features of his pedigrees for families with this trait? a. Only females will have this dominant trait. b.