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Yakvenalex [24]
3 years ago
5

What do nitrogen-fixing bacteria do?

Biology
2 answers:
iVinArrow [24]3 years ago
4 0

Answer:

Nitrogen-fixing bacteria is capable pf transforming nitrogen present in the atmosphere into fixed nitrogen i.e. usable for plants.

hope it helps!

KATRIN_1 [288]3 years ago
4 0
Nitrogen-fixing bacteria are microscopic organisms that are able to convert atmospheric nitrogen into compounds that occur in soil that are used by plants as nutrients
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The first invertebrates to develop a true nervous system are
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Coelenterates are the first invertebrates to develop a true nervous system.

Explanation:

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Which of the following describes the embryonic period
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There should be options for this question. I manged to find them elsewhere. They are:

A) the period during which tremendous growth occurs and the organs continue to develop and become  functional

B) the period during which the umbilical cord develops

C) the period during which the major organs and structures of the organism first develop

D) the period during which the zygote moves down to the uterus and begins to implant in the lining

The correct answer is C. The embryonic period is the period during which the major organs and structures of the organism first develop. The embryonic period lasts from implantation of the egg in the uterus until about 8 weeks from the time of conception. It is the second major stage of prenatal development, prior to embryonic is the germinal stage and lastly is the fetal stage.

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I need to know what the dependent and independent variable displayed in this graph is
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5 0
2 years ago
1. Describe DDT and summarize the history of the use and banning of DDT, including actions taken by the U.S. government. State t
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DDT stands for  dichloro-diphenyl-trichloroethane. The first kind of synthetic/artificial insecticides came into use in the 1940s. The earlier usage of DDT include:  a) Killing of malarial vectors, b) Combatting Typhus and other insect borne human diseases, c) As a pest control in crops d) as a pest control in garden, live stock production and even at homes.  

The negative impact of DDT could be felt for the first time when the pests that were earlier killed by use of DDT have now become pesticides resistant. In the 1950s in USA, the regulatory measures were adopted to reduce the usage of DDTs as its effects as a pesticides were no more long significant and also it was creating detrimental physical and psychological impacts on the human and environment.

It was in 1972 that the U.S. Environmental Protection Agency cancelled the order for banning the usage of DDT based on the adverse impact it produced on the environment, human and other life forms. Since then continuous studies are being conducted to analyse the impact of DDTs. In some later years it was established that DDT is the cause of producing tumors in liver.  

Some of the common negative impacts produced by DDT as per the U.S. Department of Agriculture :  

a) The non destructive nature – DDT can not be destroyed and thus it remains persistent in the atmosphere

b) It attacks the tissues of living organisms especially the animals and humans  ( fatty tissue)

c) It can penetrate the atmosphere to deeper extent.

Now as per the current stuation, The use of DDT is controlled and other alternatives of pest control organisms is being deduced. As per the treaty of Stockholm Convention on POPs (Persistent organic pollutants) , usage of DDT for malarial control is justified but it puts a restrictive use of DDT as pesticides in other areas.  

4 0
3 years ago
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