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IgorC [24]
3 years ago
8

What is the connection between virus prevalence and animal populations?

Biology
1 answer:
ch4aika [34]3 years ago
8 0

Rinderpest disease is caused by a virus that affects hoofed animals, including cattle and wildebeest. In the 1950s, a cattle vaccination program was implemented to eradicate the disease in the Serengeti, and this led to dramatic changes in the populations of wildebeest and other species. The figure shows the number of wildebeest in the Serengeti ecosystem (shaded circles, left y-axis) and the prevalence (i.e., percentage) of individuals infected by rinderpest disease (unshaded squares and triangles, right y-axis) from 1958 to 2003.

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1. in an ecosystem with four levels—producers, primary consumers, and two higher-level consumers—describe where the decomposers
attashe74 [19]
Decomposers, as the name suggests, decompose dead plants or animals into simple compounds. They feed on dead producers from the first levels or consumers from other three levels. Breaking them down, decomposers release nutrients that producers can use.
In an ecosystem with four levels, the first level are producers, such as plants and algae. On the second trophic level, there are primary consumers, herbivores that eat plants, for example, a deer, a rabbit, a grasshopper. The next trophic level belongs to secondary consumers that eat herbivores, for example, a wolf, a fox. The highest level is tertiary consumers that eat carnivores, for example, a bear, an eagle.
6 0
3 years ago
Which phrases describe air pressure? Select three options.
9966 [12]
  • decreases as altitude increases
  • results from a column of air pushing on an area
  • decreases due to fewer air particles pushing down

Pressure is the force exerted, by a substance, per unit area.

Explanation:

Pressure is given by the formulae;

P = F/ A

Whereby;

P = pressure

F = Force

A = area

Remember that ..

F = Ma

Whereby;

F = Force

M = mass

a = acceleration

Therefore pressure can be given as;

P = Ma / A

The mass of the above column of a substance multiplied by the acceleration due to gravity = pressure exerted by the substance.

Learn More:

For more on pressure check out;

brainly.com/question/13363709

#LearnWithBrainly

7 0
3 years ago
Read 2 more answers
What element is necessary for the production of thyroid hormone?
liubo4ka [24]

Answer:

Iodine

Explanation:

This is a trace element needed for the  synthesis of the two thyroid hormone ; T4- thyroxine and T3-triiodothyronine. Four iodine molecules are added in T4 synthesis, and  three for T3 synthesis. Generally T4 is the major hormone produced, but  biologically transformed into active form T3.

Iodine majorly and selenium are the two trace elements needed for thyroid hormones synthesis. Therefore required amount of iodine is important in daily diet. iIn adequate supply of this leads to under production of iodine called hypothyroidism. poor brain development ( especially in kids),and goiter.

Sea foods . eggs, poultry seaweeds are rich sources of iodine.

Conversely, when  excessive amount is present in the blood, autoimmune thyroid diseases can occur,including cancer developments in the thyroid gland due to hyper cell activities.

8 0
3 years ago
!!!BEST ANSWER GETS BRAINLIEST!!!
gizmo_the_mogwai [7]

Answer:

X and why realationship is the Distance between two given points

Explanation:

3 0
3 years ago
Read 2 more answers
G you extracted your dna from cheek cells. the concentration of your dna sample is 250 ng/μl. the dna template for pcr should be
Karo-lina-s [1.5K]
You should mix 4µl of DNA sample and complete it with 96µl (100-4) of water.

You can figure this out by using  C1.V1 = C2.V2
C1 = 250 <span>ng/μl (Sample Concentration)
</span>V1 = ?          (the necessary volume to take from the DNA sample)
C2 = 10 <span>ng/μl (PCR concentration)
</span>V2 = 100 µl (total volume)

V1 = \frac{C2 . V2}{C1} = \frac{10 . 100}{250} = 4µl

For the water: 100µl (total volume) = 4µl + Water
Water volume = 96µl
6 0
3 years ago
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