Which general function does lactase perform?

What is the difference between bacterial infections and viral infections?

Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more

The organelle pictured is found in cells of and is theorized to have once been an independent organism.