What is a blastocyst

A. a sperm fused with an egg

B. a structure that nourishes the fetus

C. a ball of about 100 cells

D. an unfertilized egg

Adaptations areA. unfavorable traits in a particular environment. b. favorable traits in a particular environment. c. traits that are acquired as an organism lives its daily life. d. traits that cause an organism harm.

Can organisms express a trait that they do not have the code for in their genes?

Module 3 states that only some genes are expressed. Why do you think this is true? Why would a gene be expressed?

A top priority of the Federal Bureau of Investigation (FBI) is protecting Internet users from what?

Antibiotics such as penicillin and streptomycin have been used to treat diseases such as Lyme disease and tuberculosis. Which types of disease-causing organisms can be killed or reduced in number by antibiotics? A.

Why can the same earthquake have different ratings on the Richter Scale and the Moment Magnitude Scale?

Which of the statements best describes the process of crossing over during meiosis? Haploid daughter cells trade chromosomes in pairs. Homologous chromosomes pair up and exchange segments of DNA.

A marine clam is mistakenly added to a freshwater aquarium. What will happen to the clam and why? Popcorn sold at movie theaters is very salty, causing people to become thirsty and to buy so drinks. Explain why salty popcorn causes this thirst.

What is the function of reproductive system?

A diploid cell with 2n = 20 chromosomes goes through meiosis. how many chromosomes will each of the daughter cells have?