About 800 ash trees live in a protected forest area. Which statement below would have the LEAST effect on the population of ash trees?
O A drought occurs and trees receive one half of their normal amount of rainfall.
O A new species of tree is introduced that grows taller and blocks half the sunlight that ash trees
typically receive.
O A group of scientists cuts down 7 of the 800 trees.
One-third of the trees are removed to build new houses.

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?