Dr. banks modifies her design and conducts a second study. she uses the same number of dogs and the same design, except now she rewards one group of dogs with miniature hot dogs and another group with pieces of apple. she finds a big difference, with the hot-dogs group learning the command faster. dr. banks avoided a null result this time because her design:

Which two levels of the spine that can undergo flexion and extension?

Explain why methicillin resistant staphlococcus aureus (mrsa) is more prevalent now than it was only 30 years ago. a. antibiotics cause mutations in staphlococcus aureus that lead to an increase in the number of methicillin-resistant strains. b. methicillin resistance causes an infection to spread more rapidly.c. frequent and inappropriate use of methicillin-type antibiotics has provided selective pressure that has resulted in an increase in the proportion of methicillin-resistant strains of staphlococcus aureus.d. diseases like aids have made people more vulnerable to infections from staphlococcus aureus.

During polarization,potassium has a blank charge,sodium has a blank ch arge ,and calcium has a b l ank. charge