What gas contributes to 78% of earth's modern atmosphere? a. argon b. nitrogen c. oxygen d. carbon dioxide

Related Questions

• I am prokaryotic and am found everywhere. What kingdom do I belong to? Protista Archaebacteria Fun Eubacteria
• In darwin's day, most people believed that the characteristics of offspring are an average of their parent's characteristics. this concept is called __________ inheritance.
• Which of the following is the best example of a way human lifestyles affect environmental systems? Burning fossil fuels increases the amount of greenhouse gases in the atmosphere. Using radioactive materials causes ground pollution when chlorofluorocarbons (CFCs) seep into the ground. Deforestation causes water pollution by decreasing water vapor in nearby lakes and rivers. Using aerosol sprays increases the amount of ozone (O3) in the atmosphere.
• Radiographic (x-ray) imaging of the uterus and fallopian tubes after injection of contrast material is called: a. hysterosalpingography b. hysteroscopy c. pelvic ultrasonography d. mammography
• The process by which a sperm cell combines with an egg cell is called
• In 2015, a large group of female walruses and their calves convened on a single beach in Alaska. Traditionally, walruses utilized sea ice as a resting and nursing ground for their young. However, due to anthropogenic activities and global warming, significant portions of the sea ice have melted. This situation could have several consequences for the walruses and their ecosystem over time. Firstly, the overcrowding on beaches can lead to increased mortality rates among calves due to stampedes when the walruses are startled. This could potentially result in a decline in the walrus population. Secondly, without sea ice, walruses are forced to swim longer distances to find food, which can be particularly strenuous for the young, possibly leading to starvation and reduced survival rates. Thirdly, the benthic habitats—the sea floor ecosystems—could be adversely affected due to the increased pressure from more walruses foraging in a concentrated area. This could lead to the depletion of food resources, affecting not only the walruses but also other species that rely on the same food sources. Lastly, there could be broader ecological impacts as the balance between predators and prey shifts. Other arctic animals that depend on sea ice for their life cycles may also be forced to alter their behaviors, potentially disrupting the entire marine food web.
• Which of these statements about light is correct? a. It travels slower than sound. b. It travels slower than electric charges. c. It travels fastest through water. d. It travels fastest through a vacuum.
• What does it mean for an atoms behavior if it is missing electrons in the valence shell?
• Which of the following represents a difference between RNA and DNA? a none of these are correct b DNA contains the base thymine and RNA contains the base uracil c RNA contains the sugar deoxyribose and DNA contains the sugar ribose d DNA is single stranded and RNA is double stranded
• what does each codon code for