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Katen [24]
3 years ago
13

What proportion of all species that ever lived has become extinct?

Biology
1 answer:
yan [13]3 years ago
4 0
More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described. 
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Suggest two ways that reflex reactions help maintain homeostasis in the human body.
Vikki [24]

Answer:

1. Sweat makes the body cool off in the heat

2. Shivering in the cold

Explanation:

sweat is a reflex that the body makes to maintain homeostasis. the purpose is to make the human body cooler as if it was water produced by the body. On the other hand, shivering in the cold produced heat made by body movement.

7 0
2 years ago
Why are scientists concerned about the use of the Bt toxin which is used to kill insects in genetic engineering
xxMikexx [17]

<span>The toxin Bt (endotoxin CrylA (b)) Bacillus thuringiensis  that is a normal inhabitant of the soil, showed himself as a natural insecticide used by farmers engaged in organic farming. In contrast to the Bt-toxin produced by bacteria, genetic engineers included it pesticide in every cell of the seed, and therefore distributed throughout the adult plant, the products from which then are consumed by man. </span>That's why scientists are concerned that after the use of a BT toxin products people get antibiotic resistance and resistance to bt.

8 0
3 years ago
Read 2 more answers
What is the high energy molecule formed at the end of cellular respiration called?
babymother [125]
The answer is ATP. 
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6 0
2 years ago
If a user performs a query that restricts the rows returned based upon a specified date, the date must be enclosed in ____.
s344n2d4d5 [400]
The answer should be <span>single quotation marks</span>
6 0
2 years ago
1. In addition to mechanical and chemical digestion of food, the stomach's other major function is: carbohydrate and nucleic aci
Alenkasestr [34]

Answer: Food storage

Explanation:

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Here, the food is stored until it is completely broken down into simpler form and enzymes act on them.

The food is then absorbed in the small intestine. But before this food is temporarily stored in the stomach where all the digestive juices and enzymes come to act on the food.

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2 years ago
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