Answer:
Heart is a muscle with 4 chambers while lungs is an organ and exists in pair
Explanation:
Heart is a form of muscle which has 4 chambers namely The right ventricle, the left ventricle, the left atrium, and the right atrium responsible for pumping blood while the lung are organs responsible for respiration or breathing. They have tiny sacs called alveoli and are found in pair.
Answer:
Nitrogenous bases have two distinct families known as purines and pyrimidine, nitrogenous are the building blocks or monomer units of the nucleic acids.
The major and significant difference between purines and pyrimidines is the difference in their structures-
The purines are divided into two different bases called adenine and guanine and each of them have a two-ringed structure formed with a 9-membered molecule and 4 nitrogen atoms which makes it a large in size than purines.
The pyrimidines are divided into 3 bases that are cytosine, uracil, and thymine and all these have only one single ring of six members and 2 nitrogen atoms. These are smaller in size.
The endocrine system is responsible for maintaining homeostasis of the body via rapid transmission of electrical signals. This system is the group of glands that are responsible of producing hormones that functions to regulate growth and development, metabolism, tissue function, sleep, reproduction and other processes in the body. The glands are being controlled by stimulation of the nervous system and by the chemical receptors that are in the blood. It consists of the thyroid gland, parathyroid gland, pituitary gland, adrenal gland, ovaries for females and testicles for males and the pancreas. This system affect almost all of the organs and cells in the body.
The main source of carbon dioxide in an ecosystem is the carbon dioxide gas present in the atmosphere. This carbon dioxide is used by the plants and animals in different ways.
The plants use this carbon dioxide to perform the process of photosynthesis.This is carried out by the help of green pigment called chlorophyll that absorbs light from the sun, water from soil and carbon dioxide from atmosphere.
The carbon in animals comes when they eat these plants.
Answer:
I could be wrong, but I believe the answer is D) State and National parks
