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Artyom0805 [142]
3 years ago
7

The Calvin cycle of photosynthesis begins when A. carbon dioxide is attached to RuBP. B. the reduction of carbon dioxide occurs.

C. electrons leave a photosystem. D. light becomes available.
Biology
2 answers:
Gennadij [26K]3 years ago
5 0
The Calvin cycle of photosynthesis begins when the carbon dioxide is attached to RuBP (A). The Calvin cycle refers to the light-independent reactions in photosynthesis. The Calvin cycle occurs in three steps.The Calvin cycle is indirectly dependent on the light since the energy carriers, for example, ATP, are products of light-dependent reactions. The second step is that the CO2 is fixed from an inorganic molecule to an organic molecule. In the third and final stage, RuBP is regenerated. This enables the system to prepare for more CO2 to be fixed. 
stepan [7]3 years ago
4 0
I know for sure the answer is A         
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Phantasy [73]

Answer:

1- Option A) describes an index fossil. Trilobite existed for a short time, but was abundant and lived in many locations.

2- Option B) Continents were once joined and have since drifted apart.

Explanation:

1) Fossils are animal and vegetable rests found in different strata of sedimentary rocks. Sedimentary layers deposit chronologically, so they are used to reflect history. They keep in each layer some of the forms of life that inhabited that area in the past. These fossils turn to be very useful while dating ages. The term Index fossils refer to those fossils that only existed in a given era or geological period during evolution.  

Index fossils must:    

• Be easily recognizable and distinguishable from all the other fossils

• Have lived in a relatively short geological period

• Present a wide geographic distribution

• Have lived in different sedimentary basins

• Appear in different types of rocks

• Be abundant

<em>A) Trilobite existed for a short time, but was abundant and lived in many locations. </em>The species accomplish the requirements. It is easily recognizable, had a wide geographic distribution, was abundant, and lived for a short time.  

2) The tectonic plates theory states that there is a continual movement of the crust. It explains the movement of the different plates and their directions and interactions. The continental drift theory explains how these movements have been taking place since millions of years ago. When continents were together in a unique continent, many species used to inhabit it. When plates started to separate, they took some of these species that got apart by the ocean. Some species were already dead and fossilized, while some other organisms died during continental drift and got fossilized after the divergence. <em>The existence of the same fossils, placed in the same layers and of the same age, suggests that they used to inhabit the same area and died during the same time, meaning that continents were together when they got fossilized. </em>

5 0
3 years ago
Which of the following best explains why a cell spends most of the time during the cell cycle in interphase?
worty [1.4K]

Answer:

c) growth of the cell and replication of DNA prepare the cell for division

4 0
3 years ago
Which of the following could limit the growth of a population of squirrels in a local park?
leonid [27]

Answer:

D

Explanation:

They would be dying off, or leaving to get away from the disease

6 0
3 years ago
Read 2 more answers
Which of the following are reactants of cellular respiration?
Ede4ka [16]
<h3><u>Question</u><u>:</u><u>-</u></h3>

Which of the following are reactants of cellular respiration?

glucose, water, carbon dioxide

water and glucose

carbon dioxide and glucose

oxygen and glucose

<h3><u>Answer</u><u>:</u><u>-</u></h3>

glucose, water, carbon dioxide

<h3><u>Explanation:</u><u>-</u></h3>

Cellular or aerobic respiration is a series of chemical reactions that begin with a sugar reactant in the presence of oxygen and produce carbon dioxide and water as waste.

8 0
2 years ago
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Which of the statement(s) is (are) not right __________. a. mRNA: contains protein-building instruction b. tRNA: deliver free am
Alina [70]

Hi there!

We can go through the overall function of all three of these:

mRNA: transcribed from the DNA, has the protein's composition written in it, and brings that to a ribosome where the protein will be made

tRNA: looks at the codons (set of 3 nucleotides) on the mRNA and brings amino acids which match up to that codon

rRNA: significant part of the composition of ribosomes

Now, looking at these, and back to the answer choices, we can already see that a, b, and c are correct. d, on the other hand, is incorrect.

Hope this helps! Feel free to let me know if you have any questions about this specific problem.

3 0
3 years ago
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