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victus00 [196]
3 years ago
14

Which of the following defines the Permian-Triassic? a The mass extinction that could occur if an asteroid were to hit the Earth

. b A catastrophic event where 90 percent of the ocean's species were lost and 70 percent of the land life was thought to go extinct. c The effects of repeated NEOs entering our Solar System d The Great Dying that is said to have completely destroyed all life, making it a mass extinction
Biology
2 answers:
Elena-2011 [213]3 years ago
4 0
It's (B) A catastrophic event where 90 percent of the ocean's species were lost and 70 percent of the land life was thought to go extinct.
Nataly_w [17]3 years ago
4 0

Answer:

Option b, A catastrophic event where 90 percent of the ocean's species were lost and 70 percent of the land life was thought to go extinct.

Explanation:

In the Permian period large mass extinction of the Earth took place. This incident took place some 299 years ago.

The super continent Pangaea was emerging during the Permian period which caused severe extremes of climate and environment as it was extremely large in size. Much of the region was under ice caps and was frozen.

Nearly 90 percent of all marine species and 70 percent of all land animals became extinct.

Hence , option A is correct

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Which of the following are disadvantages of mono-culture cropping?
professor190 [17]
The answers is all of the above
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forsale [732]

Answer:

13 - D

14 - D

15 - C

Explanation:

for 13

A molecule is two or more atoms chemically combined

An example would be carbon dioxide which contains the two atoms, carbon and oxygen

Reasons its not the other answers:

Electrons, Protons and Neutrons are all parts of an atom therefore they cannot be classified as molecules.

For 14

Remember an atom is the most basic unit out of the units we are talking about

The answer would be D

Reasons its not the other answers

Water is considered to be a molecules as it contains two or more atoms (hydrogen and oxygen)

Air is considered to be a mixture as it contains oxygen and nitrogen which can be separated

Salt is considered to be a compound because salt is made up of two atoms (chloride and sodium) in which they are held up by an ionic bond

For 15

The answer would be C (III only)

Carbon hydrogen and oxygen all happen to by atoms

Reasons its not other answer choices:

Like stated previously water is considered to be a molecule therefore we can eliminate the other answer choices

Other notes:

Compounds and molecules both are combinations of two or more atoms however they are not to be mixed together

the main difference between compounds and molecules is how they are held together

Compounds are held together by ionic bonds while molecules are help up by covalent bonds

compounds and molecules  are made up of atoms that cannot be separated

Mixtures - A mix of two or more substances that can be separated

3 0
3 years ago
Are there side effects to a garden? explain
defon
It is possible that there are side effects to a garden. One possible side effect is the excessive amount of moisture which could loosen up the soil. Also a bunch of bugs will begin to appear that could just eventually kill the garden in the long run if not treated properly 
8 0
3 years ago
Investigator A has biological specimens that are coded and linked to identifiers of the source individuals. Investigator A provi
ladessa [460]

Answer:

The correct answer is option C.

Explanation:

Human subject research is an investigation or research that include human as the subject. In other words, An Investigator conducts clinical research on humans getting data through interaction and intervention of individuals.

investigator A has investigated biological specimens. These specimens are coded and linked to the identifiers. Investigator B's research using biospecimens human subject is not according to the human subject research in the federal regulations as investigator B did not get the individual identifiers.

Thus, the correct answer is option C.

7 0
3 years ago
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