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 ?

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

What does natural resource management aim at ?

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.