Answer:
1.the smallest structural and functional unit of an organism
it was discovered by Robert Hooke
2. the unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
3 .Microscopes allow humans to see cells that are too tiny to see with the naked eye. Therefore, once they were invented, a whole new microscopic world emerged for people to discover
4. there are two basic kinds of cells: prokaryotic cells and eukaryotic cells.
prokaryotic cells :are simple cells that have no cell nucleus
eukaryotic cells: are complex cells with many organelles and other structures in the cell.
5.Plant cells have a cell wall in addition to their cell membranes while animal cells only have a surrounding membrane.
Both plant and animal cells have vacuoles but they are much larger in plants, and there is generally only 1 vacuole in plant cells while animal cells will have several, smaller ones.
6.PLASMA MEMBRANE/ CELL MEMBRANE
CYTOPLASM.
NUCLEUS.
7.Some substances pass through small holes in the surface cell membrane. This is called diffusion and does not require the cell to expend energy
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Explanation:
The scientific name for the red maple is Acer Rubrum.
Systemic circulation is the one that oxygenates all the body.
Starting from the left atrium, through the left ventricle, and the aorta and its branches to the body.
After the tissues do the exchange, the deoxygenated blood goes back to the right atrium to starts the pulmonary circulation, and then the cycle starts again.
The challenges/limitations in rainwater harvesting in urban areas include the following:
<h3>What is Rainwater harvesting?</h3>
This involves the collection and storage of rain water from roof tops etc. The water is then used for agricultural activities.
The remedial measures for the challenges mentioned above include the following:
- Unpredictable Rainfall- Weather forecasts and efficient storage
- Regular Maintenance- Use of standard materials and efficient drainage system
Read more about Rainwater harvesting here brainly.com/question/1243231