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hjlf
2 years ago
13

Which problem does the Montreal Protocol attempt to remedy?

Biology
1 answer:
madreJ [45]2 years ago
5 0

Answer:

A.The hole in the ozone layer

Explanation:

• Montreal protocol is an international treaty that was signed to control the use of substances that are resulting in the depletion of the ozone hole.

This treaty was signed in the year 1987 and became effective form 1989.

• Since the time that this treaty has come into force, there has been a significant improvement in the ozone hole that was observed over Antarctic as it's size has decreased.

• This improvement has been possible because the treaty helped to phase out chemicals such as chlorofluorocarbons, carbon tetrachloride, etc. that are responsible for ozone hole depletion.

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Một phân tử ADN có cấu trúc xoắn kép, giả sử phân tử ADN này
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A recent study of the marine hawksbill turtle's stomach contents revealed that sponges constitute a major portion of their diet.
bearhunter [10]

Answer:

These structures that protect the sponges from most predators, but not turtles, are spicules.

Explanation:

Sponges <em>skeleton</em> is composed of <em>calcium carbonate and siliceous</em> micro-structures called <u>spicules</u>. Their morphology is so varied that it is used in taxonomy for identification and classification.

There are different kinds of spicules:

-         <em>Monoaxonic spicule</em>: needle-shaped, straights or curves

-         <em>Tetraxonic spicules:</em> they have four prolongations

-         <em>Triaxonic or Hexaxonic spicules</em>

-         <em>Poliaxonic spicules </em>

Two terms can be applied to any of these spicules kinds:

-         <em>Megaspicules</em>: They are elongated and compose the main architecture of the sponge skeleton

-         <em>Microspicules</em>: Variable in shape and size, with ancillary functions

Sponges have few predators thank to the spicule structures and their high toxicity. Many of them are capable of perforating soft tissues and producing urticant substances.

6 0
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archaeans differ from eukaryotes and bacteria in that Choose one: A. archaeal membranes use ester links to bond glycerol to side
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Answer:

D. archaeal membranes contain L-glycerol.

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