Crossing over is an event during meiosis that dramatically increases variation in offspring. This cvent occurs between what structures?
a. Chiasma
b. Sister chromatids
c. Nonhomologous chromosomes
d. Nonsister chromatids

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Por qué crees que los huevos con cáscara se llaman amnióticos?