In humans, gender is determined by the 23rd pair of chromosomes. xx results in females, whereas xy results in males. what fraction of a male's sperm would be expected to bear an x chromosome?

Mario hears his brother open the door, so he turns toward the door to say hello. Which best describes the signals moving through Mario's nervous system to make him react and turn around?

Blue food coloring is poured into a beaker of water. The food coloring diffuses and turns the water blue. Which of the following would influence the rate at which the food coloring diffuses? A. concentration of the food coloring B.

Why is rapid evolutionary change more likely to occur in small populations?

What happens to codeine in the body

What's average temperature for a city fir a year

What are giant, multinucleated cells that remove and recycle bone matrix called?

A garden is an example of a

During what geological period do the angiosperms become more common

Many questions about ethical concerns and issues of personal morality cannot be answered by science. True False

This nutrient is needed for proper growth and development and functions to repair and replace body cells.