I think it is B because horses now have flat teeth, while horses back then had sharper teeth, I think. Tell me if I am wrong.
Answer:
ans1 )Amongst the pollutants pesticides, heavy metals, and detergents are the major cause of concern for aquatic environment because of their toxicity, persistency and tendency to accumulate in organisms.
ans2 )Oil spills into rivers, bays, and the ocean most often are caused by accidents involving tankers, barges, pipelines, refineries, drilling rigs, and storage facilities. Spills can be caused by: people making mistakes or being careless. equipment breaking down.
ans3 ) The Environmental Protection Agency is a United States federal government agency whose mission is to protect human and environmental health. ... It oversees programs to promote energy efficiency, environmental stewardship, sustainable growth, air and water quality, and pollution prevention.
Explanation:
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Cells, like humans, cannot generate energy without locating a source in their environment. However, whereas humans search for substances like fossil fuels to power their homes and businesses, cells seek their energy in the form of food molecules or sunlight. In fact, the Sun is the ultimate source of energy for almost all cells, because photosynthetic prokaryotes, algae, and plant cells harness solar energy and use it to make the complex organic food molecules that other cells rely on for the energy required to sustain growth, metabolism, and reproduction.
Cellular nutrients come in many forms, including sugars and fats. In order to provide a cell with energy, these molecules have to pass across the cell membrane, which functions as a barrier — but not an impassable one. Like the exterior walls of a house, the plasma membrane is semi-permeable. In much the same way that doors and windows allow necessities to enter the house, various proteins that span the cell membrane permit specific molecules into the cell, although they may require some energy input to accomplish this task
The nucleus, water in them, organelles.
Hoped this helped.
~Bob Ross®
Bio engineering has provided the ability to regrow tissue for knee or hip joints.
