Ecosystems need producers because they are the start of the food chain.
Producers are consumed by first consumers, the second consumers and so on.
Answer:
A. Rheumatoid arthritis is characterized by periods of remission and exacerbation
C. Rheumatoid arthritis can cause fatigue and weight loss
Explanation:
Answer: Substances that are protein based cannot cross the lipid cell membrane, but can exert their effect by binding to the proteins based receptors present on the lipid bilayer.
Explanation:
Hormones such as calcitonin , Parathyroid hormone and pituatry horomones are proteins and water soluble.They cannot cross lipid bilayer but can bind to ligand binding protein receptors.
These receptors are protein macromolecules that are specific in nature for specific hormones.
After binding to the receptors, these hormone-recpetor complexes activate second messengers and regulate the downstream effects.
Answer:
These efforts will decrease the amount of heat that the atmosphere traps.
Explanation:
Both Carbon dioxide and methane are considered to be green house gases.
However, green house gases are known to cause climatic changes by trapping or absorbing heat from the sun or in some other cases, produces large amount of heat through combustion, the result which can give rise to respiratory disease from smog and air pollution.
Hence, when Scientist tried to reduce the amount of carbon dioxide and methane into the atmosphere their efforts will decrease the amount of heat that the atmosphere traps.
