Question

7 where low oxygen levels have killed all ocean life is called...
a photic zone
b aphotic zone
c dead zone
d intertidal zone
8 what is a natural process that is raising the temperature of the earths surface?
a smog
b greenhouse effect
c habitat destruction
d air pollution
9 global warming is...
a the increase in earths average surface temperature.
b the decrease in earths average surface temperature.
c the increase in earths average oxygen emission.
d the decrease in earths average co₂ emissions.

1. based on the diagram below, how much has earths temperature risen since the 1960s?
2. what is causing the sea levels to rise?

a acid rain
b runoff
c melting of ice sheets
d heavy rainfall

1. which organism is most likely impacted the most negatively by the rising sea levels?

a polar bears
b giraffes
c white - tailed deer
d starfish

Explanation:

• Question 7: A dead zone is an area in a body of water where low oxygen levels (hypoxia) cause the death of marine life. The photic zone has sufficient light for photosynthesis, the aphotic zone has no light, and the intertidal zone is the area between high and low tides.
• Question 8: The greenhouse effect is a natural process where gases in the Earth's atmosphere trap heat, raising the Earth's surface temperature. Smog and air pollution are forms of pollution, and habitat destruction is related to the loss of living spaces for organisms.
• Question 9: Global warming is defined as the increase in Earth's average surface temperature. Options b (decrease in temperature) is incorrect. Option c is about CO₂ emissions (a cause of global warming, not the definition). Option d (decrease in CO₂ emissions) is also incorrect.
• Question 10: Looking at the y - axis (temperature in °C) and the x - axis (year), from the 1960s (around 0.0°C) to 2020 (around 1.0°C), the temperature rise is approximately 1°C.
• Question 11: The melting of ice sheets (from glaciers and ice caps) adds water to the oceans, causing sea - level rise. Acid rain, runoff, and heavy rainfall do not have the same large - scale impact on sea - level rise as melting ice sheets.
• Question 12: Polar bears live in Arctic regions where sea - ice is crucial for their hunting (e.g., for seals). Rising sea levels (and the associated loss of sea - ice due to warming) negatively impact their habitat. Giraffes live in savannas, white - tailed deer in various terrestrial habitats (not directly affected by sea - level rise in the same way as polar bears), and starfish are marine organisms but not as severely impacted by sea - level rise in terms of habitat loss as polar bears.

Answer:

1. c. Dead zone
2. b. Greenhouse effect
3. a. The increase in Earth’s average surface temperature
4. a. 1°C
5. c. Melting of ice sheets
6. a. Polar bears