Answer:
The correct answer is A. active transport
Explanation:
There are two types of transport which helps in the transport of molecules across the cell membrane. These are active transport and passive transport. In passive transport, the molecules move across the membrane without any energy expenditure and down their concentration gradient.
In active transport, molecules move against their concentration gradient with the help of ATP so in active transport, molecules can be present in high concentration outside or inside the cell.
Sodium is an ion that moves by active transport in and out of the cell with the help of sodium-potassium pump so it's so the correct answer is A.
Answer:
Robots are not made of cells.
Explanation:
The correct sequence is:
1 Producers ( grass ): The producers are the green plants that produce food for the consumers. Green plants are the producers and energy produced is transferred to primary consumers
2 Primary consumer (mouse): The primary consumers include bacteria and herbivores that feed on the green plants for their energy
3 Secondary consumer (cat): The secondary consumers include the cat and other small animals that feed on primary consumers
4 Tertiary consumer (wolf): The are the at the highest level of hierarchy and feed on secondary consumers for their food. Example wolf,eagle
With the beginning of the middle proterozoic comes the first evidence of oxgen build up in the atmosphere. with is catastrophe came eukaryotic forms. these include multicellular algae, and toward the end of the proterozoic the first animals
Semi-conservative DNA replication means that one stand is new DNA and the other contains a newly synthesized strand.
