It's an example of a molecule
Answer:
No, there are some organisms that only have one cell, although there are organ systems that are made up of many cells. Not all organisms have organ systems.
Explanation:
For example, the Trichoplax. It is an animal with no organs that is tiny and multicellular, and only feeds on microalgae. A Trichoplax are flat organisms about a millimetre in diameter with no internal structures and typically have two cellular layers. These organisms live in the oceans and seas all around the world but are not necessarily found in their natural habitat, more so in captivity such as a marine aquarium. Trichoplax are found to live in symbiosis with such things as bacteria and others in the oceans and seas.
Answer:
explanation below
Explanation:
Dichlorodiphenyltrichloroethane, also known as DDT is a chemical compound that is found in insecticides. In 1972, the United States Environmental Protection Agency issued an order for the cancellation of requests for the chemical compound because it affects wildlife and pose risks to humans as well.
From the question here, it was noted that the initial concentration was 22ppm 25years ago and so if it takes 7years to decay by half, the actual concentration in present day farmers could be calculated as follows;
25years ago - 22ppm
18years ago - 11ppm
11years ago – 5.5 ppm
4 years ago - 2.75ppm
Since 7yrs = 0.5
Then 4yrs will be [ [4/7] x 0.5] = 0.2857
Then if 0.5 = 2,
Then 0.2857 = [ [ 0.2857/0.5] x 2] = 1.1428
So present year concentration would then be [2.75ppm/1.1428] = 2.406ppm
Answer:
21
Explanation:
bcecause thats the only one
Answer:
z+4
Explanation:
An isotope of an element, atomic number Z, has a mass number 2z+4. How many neutrons are there in the nucleus of the element?o
protons + neutrons =mass number
so
z +neutrons = 2z+4
neutrons = 2z+4 - z=z+4 which is the # of neutrons in the nucle
us