Answer:
The Carbon Cycle
- Carbon moves from the atmosphere to plants. ...
- Plants and animals to soils. ...
- Carbon moves from living things to the atmosphere. ...
- Carbon moves from fossil fuels to the atmosphere when fuels are burned. ...
- Carbon moves from the atmosphere to the oceans.
Explanation:
The carbon cycle is the process in which carbon travels from the atmosphere into organisms and the Earth and then back into the atmosphere. Plants take carbon dioxide from the air and use it to make food. Animals then eat the food and carbon is stored in their bodies or released as CO2 through respiration.
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By interacting with the external environment, if you mean how molecules are transported outside and into the cell then there are 3 main ways of transport.
Passive transport which refers to the movement of molecules into the cell without using any energy. This includes osmosis (movement of water), diffusion (movement of small molecules like salt) and facilitated diffusion which is the movement of large molecules such as glucose via by channels on the plasma membrane.
Note, in diffuson the cell wants equilibrium which means that the cell wants the same ratio of a specific type of molecule compared to the external envionrment. In other words, it's like a a very salty cell becoming less salty because the external envionrment is less salty.
Active transport refers to the movement of molecules against the concentration gradient using energy.
Bulk transport which refers to the movement of molecules that is influenced by the plasma membrane. One of the ways is for the plasma membrane to engulf particles or expel particles. This allows cells to remove waste.
Go look it up on Khan academy.
Reproductive systems are built via meiosis while other body systems such as skin production goes through mitosis
That answer is b- nucleotide
Answer:
Brain is the main organ of this system- nervous system.
Produces hormone- Endocrine System
Breaks food down for body's use Digestive System
Sends nutrient to all the body cells circulatory system.
Provides structure for the body and
provides support and movement- Skeletal system
Kidneys are the main organs of this system- Excretory system
lungs are the primary organs of this system Respiratory system