Answer:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Explanation:
The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (
), in grams, is described below:
(1)
Where:
- Initial mass, in grams.
- Time, in years.
- Time constant, in years.
The time constant can be found from half life (
), in years, described in statement:
(2)
If we know that 
, 
and 
, then the current amount of the sample is:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Answer:
Grizzly bears have many other adaptations that help them find food and survive. For example, they have a distinguishing shoulder hump that is actually a mass of muscle, which enables brown bears strength to dig. Also, their claws are long, making them useful in digging for roots or digging out burrows of small mammals.
Answer:
<em>d. Tundra</em>
Explanation:
Tundra <em>is a sort of biome in physical geography, where cold temperatures and short growing seasons hinder the growth of the plant.</em>
This consists of dwarf shrubs, sedges and grasses, mosses and lichens. In some tundra areas, scattered trees are growing.
The tundra-forest ecotone (or ecological boundary region) is called the tree line or timberline.
Answer:
Definitions. Land use (direct). The purpose for which an area of land is used by humans: e.g. cropland, urban settlements, forests. Wild or natural land, by contrast, is that not used by humans. Land use (indirect).
Answer:
A. Water
Explanation:
Seeds only germinate when rains occur, so death by dehydration less likely
