Answer:Cells have many structures inside of them called organelles. These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA.
Energy sources are classified as nonrenewable because they do not form or replenish in a short period of time. Renewable energy sources such as solar and wind replenish naturally in a short period of time.
The four major nonrenewable energy sources are
<span>- Crude oil
- Natural gas
- Coal
- Uranium (nuclear energy) </span>
Nonrenewable energy sources come out of the ground as liquids, gases, and solids. We use crude oil to make liquid petroleum products such as gasoline, diesel fuel, and heating oil. Propane and other hydrocarbon gas liquids, such as butane and ethane, are found in natural gas and crude oil.
All fossil fuels are nonrenewable, but not all nonrenewable energy sources are fossil fuels
Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from the buried remains of plants and animals that lived millions of years ago.
Uranium ore, a solid, is mined and converted to a fuel used at nuclear power plants. Uranium is not a fossil fuel, but it is classified as a nonrenewable fuel.
The answer is B. Invasive species are successful in novel environments due to lack of a natural predator or competition. Therefore if the non-native share a niche with other fish in the lake ecosysem, there will definitely be competition for resources. This could lead to competitive exclusion of one species or resource partitioning between the species. Consequently, the non-native fish species will not invade the new environment unchecked.
Valves in veins have an anatomic structure similar to semilunar valves of the heart
This is further explained below.
<h3>What are semilunar valves?</h3>
Generally, There are structures that look like pockets and are joined at the point where the pulmonary artery and the aorta exit the ventricles. These structures are called the semilunar valves.
The opening that connects the right ventricle to the pulmonary artery is protected by a valve called the pulmonary valve.
In conclusion, Vein valves have an anatomic structure that is comparable to that of the semilunar valves found in the heart.
Read more about semilunar valves
brainly.com/question/20012497
#SPJ1
