If a person is heterozygous for the sickle-cell allele, they are protected from both malaria and sickle-cell anemia. this is called:

What is the end result of meiosis?

The brain and spinal are covered by what?

Which body system is correctly paired with its function? A) excretory-produces antibodies to fight disease-causing organisms B) digestive-produces hormones for storage and insulation C) circulatory-transports materials for energy release in body

Computers are so powerful that k-12 educators and students are now able to produce their own multimedia and webased learn materials

A man with type ab blood and a woman with type b blood have a baby has type o blood. should there be any reason for concern? why?

Protists use cilia to move within their habitat, but ciliated human cells like those in the bronchi are always anchored to one another and to an extracellular matrix; what benefit does cilia provide these cells?

Which of the following concepts promotes development in both piaget's cognitive development in both paigets cognitive development theory and eriksons psychosocial theorory

Brian made this table to organize his notes on changes of state change of state energy change melting gain freezing lose deposition gain condensation lose

What is the name of the type of cell division that occurs in the prokaryotic cell cycle?

Select the correct answer. Why is it difficult for scientists to find fossils from the Precambrian period?