Answer: b. Bacillus megaterium
d. Staphylococcus epidermidis
Explanation:
a. Pseudomonas putida is a Gram-negative, rod-shaped bacteria.
b. Bacillus megaterium is a rod-like, Gram-positive bacteria.
c. Escherichia coli is a Gram negative, rod shaped bacteria.
d. Staphylococcus epidermidis are gram positive rods, arranged in grape-like clusters.