Which structure on the sperm propels it toward the egg?

scrotum

flagellum

semen

glands

Juliet just ran a 100-meter race. She's experiencing severe pain in her leg muscles. What is the probable reason for this?

How do you species that fill the same niche as each other survive in ecosystems?

Which outcome occurs as a multicellular organism develops? The cell grows bigger. The cells specialize. The cells are the same. The cell shrinks.

Elements are placed into the same period on the periodic table of the elements because they A. form the same type of chemical bonds. B. have the same number of electron energy levels. C. form the same type of isotopes. D.

Which of these is an example of calcium carbonate? A. diamond B. graphite C. water D. shells of snail

How does protein complex work

Cite the most common molecular explanations for dominant and recessive alleles.

17. After a person recovers from the chickenpox, the virus can lie dormant in the dorsal root ganglion in mutiple levels of the spinal cord and cranial nerves.

Give an example of an enzyme found inside human cells and its function

Describe how proteins fold, mentioning at least three rules followed by the amino acids.