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storchak [24]
3 years ago
14

. To be an index fossil, a fossil must

Geography
1 answer:
Ket [755]3 years ago
3 0

Answer:

a. They must be present in a large geographic area.

Explanation:

Index fossils can be used to determine the age of a rock strata with great precision, but they must be scattered over a large geographic area to be able to be used reliable for this type of measurement. Index fossils typically indicate a certain type of paleoenvironment belonging to a very specific prehistoric period and their formation coincides with the age of the rock layer.

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18. Which of the following is not correct about floodplains? they have recurrent problems with flooding the streams have natural
9966 [12]

Answer:

The statement that they are characterized by rapids and waterfalls is incorrect about floodplains.

Explanation:

All other points mentioned holds for flood plains:

  • Most of the floodplains are low lying areas
  • They are generally, the land areas which are adjacent to streams and rivers
  • They are subjected to repeated influx or flooding.
  • They can be simply characterized by a relatively smooth land area on whose boundary lies water stream or river which overflows or results in flooding at the time when water is high.
5 0
3 years ago
What economic issues should be considered during conservation?
olchik [2.2K]

Answer:

Hybridization may drive rare taxa to extinction through genetic swamping, where the rare form is replaced by hybrids, or by demographic swamping, where population growth rates are reduced due to the wasteful production of maladaptive hybrids. Conversely, hybridization may rescue the viability of small, inbred populations. Understanding the factors that contribute to destructive versus constructive outcomes of hybridization is key to managing conservation concerns. Here, we survey the literature for studies of hybridization and extinction to identify the ecological, evolutionary, and genetic factors that critically affect extinction risk through hybridization. We find that while extinction risk is highly situation dependent, genetic swamping is much more frequent than demographic swamping. In addition, human involvement is associated with increased risk and high reproductive isolation with reduced risk. Although climate change is predicted to increase the risk of hybridization‐induced extinction, we find little empirical support for this prediction. Similarly, theoretical and experimental studies imply that genetic rescue through hybridization may be equally or more probable than demographic swamping, but our literature survey failed to support this claim. We conclude that halting the introduction of hybridization‐prone exotics and restoring mature and diverse habitats that are resistant to hybrid establishment should be management priorities.

Explanation:

8 0
2 years ago
How many feet tall are the waterfalls in iguazu falls.
DerKrebs [107]

Answer:

between 200 and 269 feet (60 and 82 metres) in height.

Explanation:

8 0
2 years ago
How is energy security determined
zlopas [31]
Energy security is the association between national security and the availability of natural resources for energy consumption. Access to (relatively) cheap energy has become essential to the functioning of modern economies.
5 0
3 years ago
Why was John C. Calhoun opposed to the tariffs of 1828 and 1832?
Kobotan [32]
Calhoun was vice president of the United States in 1824 under John Quincy Adams and was re-elected in 1828 under Andrew Jackson. Jackson was for the Tariff of 1828 and caused Calhoun to be opposed to Jackson, which led to Calhoun's resignation in 1832.
7 0
3 years ago
Read 2 more answers
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