Bonjour j’ai un devoir à faire en svt je doit répondre au questions suivante : À) d’après l’observation que vous faites des cristaux de calcite et d’aragonite et d’après leurs modèles moléculaires, ces minéraux cristallisent-old dans les structures cubique simple ou cubique faces centrées . Justifier la réponse. B) trouver des structures d’organisme vivants constitués de ces cristaux . Tirer une conclusion sur cette observation .

C) On considère les documents 1 et 2 précédents.
Donner une explication aux propriétés différentes de ces cristaux de même composition chimique .

Je n’arrive pas à répondre a ces question . Pouvez vous m’aidez s’il vous plaît
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Simulating adaptations in a species in this activity, you will discuss in detail the adaptations in a species of rain forest plants. you will build a simulation that explains the changes in the traits of the plant population over 10 years. you will also establish a scientific explanation to justify the changes in the traits of the population, * time to complete: 1-2 hours part a an organism's adaptations are specific to its native environment. an organism that lives in a coniferous forest will have different adaptations compared to an animal that lives in a tropical rain forest. the following graphs show the temperature and precipitation throughout the year for two different forests: a coniferous forest in canada, and a tropical rain forest in belize. evaluate the graphs, and then explain why plants from these two ecosystems will have different adaptations. in your answer, explain the survival challenges that plants face in these two environments.

Use this new information to determine the parents’ genotypes (indicated by red arrows). then calculate the probabilities that the second male offspring will have each condition. drag one pink label to each pink target and one blue label to each blue target. then use the white labels to answer questions 1 and 2. labels can be used once, more than once, or not at all.

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.