A species of cactus has spines. How would biologists explain how a species of cactus with spines evolved from an ancestral cactus species without spines?

Which is the best definition of a prokaryote cell?

Which of the following is determined when a new drug is tested? A. Density B. Dosage C. Calories D. Flavor

The majority of the U. S. population will take a pain reliever that doubles as a fever reducer at the first hint of illness. Why is this not the best practice? A) The fever inhibits the pathogen's ability to reproduce.

If i have stress fracture of my radius bone what part of my body i have broken

Which statement is true of viroids? They are single-stranded RNA particles. They reproduce only outside of the cell. They produce proteins. They affect both plants and animals.

An organ, such as a kidney, used for transplant needs to be tested for compatibility with the person who is to receive the organ. If this is not done, the

The extraocular muscles and the muscles of mastication are part of the back muscles. abdominal region muscles. face muscles. legs and hips muscles.

How do the nucleus and the endomembrane system work together for protein synthesis?

Would more missions to the moon be a good idea?

During the 20th century, which method of studying the brain led to a burst of knowledge about the nervous system?