Which description best defines blastocyst?

A) a fertilized egg

B) an egg released from the ovary

C) a mass of specialized cells

D) an embryo with a notochord

Which of the following steps in a scientific investigation is usually taken first

What is the largest group of archaea

Which kind of muscle fibers enable the muscles to exert force for a long period of time? fast twitch slow twitch

Describe the general shape or plan of the frog's digestive system

A person infected with the human immunodeficiency virus may have any symptoms for a period of time. During this period, the virus affects the body by doing what

What part of the brain controls emotions?

What is the most important genetic factor influencing whether someone will develop osteoporosis? A. Age B. Exercise C. Gender D. Diet

Which of the following is a disadvantage of sexual reproduction? A. Most species that reproduce sexually are unable to adapt. B. Most species that reproduce sexually require a mate. C. Most sexually-reproducing organisms reproduce too quickly. D.

1. Humans start off as what?

Which behavior in a client with schizophrenia demonstrates the client's cognitive inability to appropriately process data from external stimuli?