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zepelin [54]
3 years ago
7

Why is ld50 data so useful in dealing with human health and environmental toxins?

Biology
1 answer:
alex41 [277]3 years ago
7 0
LD50 or TD50: it is the Lethal Dose 50 (to refer to animals), and Toxic Dose 50 (to refer to the human being). To refer to animals is: the dose of a drug, a drug (generally a substance) that kills 50% of a population. To refer to the human being: it is the dose of a drug, a medicine (in general a substance) that produces toxicity to 50% of a population.<span>

<span>Find the LD50, it is very important to determine the dose in which the drug produces toxic effects and thus be able to approach or deduce the effective dose, that in cases of administering a new drug to the human being, it is necessary to find the effective dose 50 (Dose of the drug that produces a therapeutic effect to 50% of the population) in order to determine the Therapeutic Margin or Therapeutic Index.</span></span>
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The theory of evolution states that all living things had a single common ancestor.
xxMikexx [17]

Answer:

no it shows that all dna can be the same but not all are exactly alike just like humans

Explanation:

6 0
3 years ago
In this project, you will observe an insect life cycle. You will see part of the life cycle of a grain beetle. You will begin wi
vlada-n [284]
Life Cycle


Mealworms that birds, reptiles, and other animals love aren’t really worms. They are the larvae of darkling beetles. There are over 20,000 different types of darkling beetles and mealworms come from the species Tenebrio molitor.

A darkling beetle experiences complete metamorphosis which means that it has four distinct stages of life. The four stages are egg, larva, pupa, and adult. The amount of time a darkling beetle spends in each stage can vary greatly due to environmental factors like temperature, humidity, food, and water.

Egg
The first stage of life is spent as an egg. The white bean-shaped egg is tiny and about the size of a speck of dust. The egg is sticky and is quickly concealed by dirt, dust, and substrate. It will take around one to four weeks for an egg to hatch and the larva to emerge.

Larva
The second stage of life lasts about eight to ten weeks and is spent as a brown larva. This is the stage where the insect is a mealworm. When first hatched, it is quite small but will grow to one to one and a half inches long.

Since it has a hard exoskeleton, the worm will need to molt and shed its hard outer shell in order to grow. Molts will occur ten to twenty times during this stage of life. A recently molted worm will be soft and white, but the exoskeleton will quickly harden.

A mealworm spends its time eating and growing in order to save up energy for the next transformation.

Pupa
During a mealworm’s last molt it will turn into a white alien-like pupa. It has no mouth or anus so does not eat. It does have leg and wing buds, but they do not function. The pupa is quite helpless and the only movement it can do is wiggle. This stage of life will last one to three weeks as the pupa transforms its organs and body into an adult.

Adult
The final stage of the insect’s life is as the darkling beetle and lasts one to three months. The beetle will be white with a soft exoskeleton. As the outer shell hardens, it will turn brown and then black. The beetle does have hard wings, but it is unable to fly.

After about one to two weeks of adult life, beetles will begin to mate and reproduce. A few days after mating, female beetles will burrow into soil or substrate and lay eggs. Darkling beetles are prolific breeders and females can lay hundreds of eggs during their adult lives.
8 0
4 years ago
Name a structure which would be found in a green leaf cell of a plant, but not in a root cell
jeyben [28]
Isn’t it Chloroplast?
4 0
4 years ago
Read 2 more answers
Which sources do scientists use to study ancient climates? Check all that apply.
stira [4]

Answer:

Its tree rings, pollen grains and fossils or 2,4, and 5

Explanation:

I got it right

5 0
3 years ago
Read 2 more answers
Which of the following is a "characteristic" of the sympathetic division
Anastaziya [24]

Answer:

Excitement

Explanation:

Sympathetic nervous system is a type of autonomic nervous system that acts as an emergency system of the body.

Sympathetic nervous system prepares the body during fight and flight response. The energy is put out in this system and protects the body from the injury. During excitement the heart speeds up, blood pressure increases and more energy is available to the body. Hence, excitement is the characteristic of sympathetic division of nervous system.

Thus, the correct answer is option (b).

6 0
3 years ago
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