Can someone explain speciation to me? I've looked it up, but, it isn't making complete sense to me.

What information would you have to know to determine the toughness of a solid? how much kinetic energy it absorbed before it broke its mass and volume what materials are able to scratch it its mass

This type of system functions without interacting with their environment. a. covert systems b. entropic systems c. closed systems d. synergistic subsystems e. open systems

Paracelsus stated, "All substances are poisons; there is none which is not a poison." What does this mean? Name a substance you would think would never be considered a poison.

Starches are to simple sugars as proteins are

6. H2Cr2O7 = Name of acid

Nucleotide are composed of phosphate group, a sugar, and a nitrogenous base. DNA is made up of long strands of nucleotide. which part if the above molecule can differ between nucleotide? A. the sugar B. the phosphate group C. the nitrogen group D.

What organ system detects stimuli, secretes chemical and electrical signals, and controls all other organs

Which tissue type allows for organ movement within the body

Explain the role of enzymes and how they affect the chemical reactions of living things

Many arthropods young do not look like adults and do not eat the same food as adults. how would this be an advantage in an environment where food is scarce