Seaweeds such as kelp are a potentially renewable source of biofuels for both electric power generation and as a replacement for petroleum-based products. which of the following is a potential issue that could change this potentially renewable resource into a nonrenewable one? - a kelp forest could become too plentiful and expand out of the forest boundaries. - kelp might not be able to produce enough foliage for biomass demand. - the kelp might not be able to replenish fast enough once depleted. - a kelp forest could produce too much oxygen for the environment to process.

Autotrophs a.consume their food to get energy b.may use photosynthesis to gain energy c.are also called consumers d.cannot use solar energy

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.

The transport tubes from food came down the plant are called?