Indiana is home to fossilized crinoids. these small, sea-dwelling invertebrates are vaguely reminiscent of starfish, and some species of crinoid are still present on earth today, but these animals were especially common in the world's oceans about 400 million years ago. how is this information important to the theory of evolution?

When plants use sunlight to make food, the energy of sunlight is

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?

Amines amides and amino acids are categories of