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?

Why don't muscles to get rid of carbon dioxide?

Nucleic acids and carbohydrates are both types of what? A. Elements B. Atoms C. Proteins D. Macromolecules

The age of viability is the time when the preterm newborn

What are three environmental factors that effect photosynthesis

The ability of whirligig beetles to gradually release a foul-tasting substance most likely results from

The question below refers to the selection "taste-the final frontier." hydroponic plants are grown - a. on mars. b. without air. c. in water. d. in soil.

The movement of hot and cold air between land and sea creates what? a. Sea breeze b. Solar energy c. Trade winds d. Coriolis effect

How does the continental divide affect the climate

Fred went to the doctor because his body was not producing semen. Which part of Fred's body was most likely functioning incorrectly to cause this problem.

What do metabolism, respiration, and digestion have in common? They break larger molecules into smaller ones. They build larger molecules. They are each single chemical reactions. They each involve multiple chemical reactions.