How do some cells become brain cells and others become skin cells, when the DNA in ALL the cells is exactly the same. In other words, if the instructions are exactly the same, how does one cell become a brain cell and another a skin cell?

Which protists are in the same eukaryotic supergroup as animals?

What happens when rain falls on a piece of property that has pavement, roofs, and lawns? Where does the water go? Describe all possible pathways. Over a long rainy season, how do streams and groundwater respond?

Why has the rate of death due to infectious disease started to rise again?

What do u understand by habitat?

A person with sickle cell trait has ___ mutated copies of the hemoglobin gene, a person with sickle cell disease has ___ mutated copies.

A series of waves with decreasing wavelength labeled A, B, C, D, E, F, G from left to right as wavelength decreases.

Cameron is collecting data to determine the time of completion for each stage of germination in seeds. He is using bean seeds for his investigation and recording his results. He repeats his data collection many times to obtain reliable results.

Which human action has not lead to significant changes in Earth's biomes?

Which two characteristics of living things do viruses exhibit?

You are studying the source of new virus that has recently infected humans. You suspect that the virus was transferred from other primates (they exhibit a similar infection), specifically chimpanzees, gorillas, or orangutans.