SCI 200--Unit Milestone--Practice 1 Questions and Answers 100% Solved

Correctly identify what event, agent or process of those given below is responsible for the current atmosphere on Earth of 20% oxygen. Volcanic activity Photosynthesis Ozone layer formation The water cycle Photosynthesis Which of the following statements about continental drift is true? Because of continental drift, the majority of most continents' landmass remains underwater, which has severely limited biodiversity. After the continents were separated, continental drift slowed, until today it is almost nonexistent. All of the continents were once one big super-continent, but their separation created more coastline, which was beneficial for biodiversity. About one hundred million years ago, all of the continents were one giant landmass called Pangaea. All of the continents were once one big super-continent, but their separation created more coastline, which was beneficial for biodiversity. Pollination is an example of a __________ service. supporting cultural provisioning regulating regulatingWhich of the following correctly defines an ecosystem? A biological community of living and non-living organisms and their environment The practice of using resources without depleting them for future societies The variety of life existing in a specific region Dependence of species upon one another A biological community of living and non-living organisms and their environment Match the graph image with its type and common use. Scatterplot that is used to show the relationship between two characteristics Flow diagram that is used to show process, sequence or flow Pie chart that is used to show groups within a group Histogram that is used to show the frequency of characteristics across groups Histogram that is used to show the frequency of characteristics across groups Which of the following is true about world population growth? The world population was less than 200 million for most of history, it was 1 billion in 1800, 3 billion in 1959 and 7 billion in 2012. World population held steady for a few thousand years before it fell sharply because of plague and famine.