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.

The correct answer is the first statement.

Explanation:

Coal, natural gases, oils, oil rigs, and fossil fuels were made millions of years ago. These fuels contain carbon that was present in the organisms and organic matters when they died, which is the original source of energy.

When we these fuels, it causes too much carbon release in the environment and atmosphere at once. The carbon forms carbon dioxide with oxygen, a greenhouse gas.

Greenhouse gases are responsible for global warming as they trap the Sun's energy in the atmosphere that leads to the rise in temperature.

Thus, the correct answer is the first statement.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

picture a world where computers are building made-to-order personalized robotic arms and synthetic organs, drones are circulating above mars! due to the rapid growth of technology, the future has never been more unpredictable, and it presents a huge challenge in education: we are teaching students how to work in a future that we have never been unsure of. it is widely predicted that in eight years’ time, there will be more jobs in the fields of science, mathematics, technology and engineering than in any other discipline. and, as the technology continues to develop, it will soon become clear that addressing social problems will involve more innovative thinking, and analytical and technical knowledge than ever before. undeniably, there are no subjects that encourage innovative and creative thinking, deep thought, problem solving and independence more than the stem subjects. while it is widely commented on that there is a need to reimagine the ways stem subjects are taught in schools by embracing a more interactive and innovative approach to appeal to more students, it should come as no surprise that some of the most reputable educational organizations in the world are already implementing changes to embrace stem. harvard, for example, announced in 2014 that they were increasing their computer science faculty by over 50% and has since introduced computer science as a core subject for all freshmen. the urgency of supporting stem subjects at a young age is becoming more relevant than ever, as adopting a keen interest in the curricula needs to happen early. however, beyond the age issue is one of gender.

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