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mixas84 [53]
2 years ago
9

When did organism that could photosynthesize appear?

Biology
1 answer:
Mekhanik [1.2K]2 years ago
8 0
B.3.5 billion years ago
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Which of the following best describes why someone with an immunodeficiency disorders may get sick more easily than someone witho
user100 [1]

Answer:

part of the immune system does not function properly

Explanation:

or A on edge

4 0
3 years ago
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which of the following is incorrect about the nitrogen cycle? a. nitrate and nitrite reductases in denitrifying bacteria convert
Serjik [45]

The incorrect statement about the nitrogen cycle is option A: nitrate and nitrite reductases in denitrifying bacteria convert ammonia to nitrogen gas.

The biological nitrogen fixation (BNF) is the process by which atmospheric nitrogen is changed into ammonia, and the nitrogen-fixing bacteria are known as diazotrophs. Fixation, ammonification, nitrification, and denitrification are significant nitrogen cycle processes. Ammonia is converted to nitrites and then to nitrates which are absorbed by plants with the help of their roots. Therefore, option A is incorrect.

Through bacteria that fix nitrogen from the atmosphere, nitrogen enters the living world. Soil bacteria convert this nitrogen and nitrogenous animal waste back into gaseous nitrogen, supplying the organic nitrogen required by terrestrial food webs.

To know more about nitrogen cycle, refer to the following link:

brainly.com/question/11662775

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6 0
1 year ago
What is the purpose of the electron transport chain in the thylakoid membrane?
Feliz [49]

Answer:

To produce energy in form of ATP

Explanation:

The thylakoid membrane harbors photosystems that will receive light photons, ejecting electrons from a main chlorophyl molecule in a reaction center, to other acceptors.  These electrons will reach the electron transport chain to create a proton gradient, and subsequently, to produce ATP.  Later on these electrons will reach the other photosystem, to produce reducing power.  This is in plants.

Cyclic photosystems also exist, in some bacteria, for example,  and only produce energy as ATP.  They also have an electron transport chain.

6 0
3 years ago
Which of the following is the legal term for an advance directive that specifies an individual's end-of-life wishes for medical
velikii [3]

Answer:

The legal term for an advance directive that specifies an individual's end-of-life wishes for medical treatment without necessarily appointing a designee to make legal decisions for him or her is called a living will

Explanation:

A living will is made when alive and it comprises of how one intend to distribute his/her wealth without any interfere by others decision even when dead. The documents must have been signed when alive by the individual

6 0
2 years ago
Which of the following is true for a parasite?
Makovka662 [10]

Answer:

C

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most of them drink their blood

5 0
3 years ago
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