A Gram stain indicates purple cells that are round and attached in chains. Which of the following best describes these results? a. Gram-positive staphylococci
b. Gram-positive streptococci
c. Gram-positive cocci, sarcinae
d. Gram-negative streptococci
e. Gram-negative streptobacilli

In a relatively small iguana population the allelic frequency is tracked for three generations. webbing is a recessive allele; no webbing is the dominant allele. during one very rainy spring and summer, a flood washes all the iguana without webbed feet out to sea. by the fall, and three generations later, you have the gene pool seen here.

How does natural selection change thephenotypes within a population over time?

Which beat describes the brain stem