Answer:
Soil pollution- Soil pollution is defined as the presence of toxic chemicals in soil
it could pose a threat to humans, etc...
caused by the presence of xenobiotic chemicals
(A xenobiotic is a chemical substance found within an organism that is not naturally produced or expected to be present within the organism.)
or other alteration in the natural soil environment. It is typically caused by industrial activity, agricultural chemicals or improper disposal of waste.
Air pollution- Air pollution is a mixture of solid particles and gases in the air.
Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles.
Explanation:
Answer:
410 =D......
sorry I have only 1 brain cell left
A stem<span> is one of two main </span>structural<span> axes of a vascular plant, the other being the root. The </span>stem<span> is normally divided into nodes and internodes: The nodes hold one or more leaves, as well as buds which can grow into branches (with leaves, conifer cones, or inflorescences (flowers)).</span>
Answer:
B. The cell's DNA has been damaged somehow
Explanation:
Cell division is a must for every living cell. Before a cell can divide, its genetic material (DNA) needs to be duplicated. However, all conditions necessary for the DNA replication and actual division (mitosis or meiosis) must be favorable. The set of genes that makes sure of this are called CHECKPOINT genes. Checkpoint is an internal controlled mechanism employed by the cell to ensure that its division occurs without errors. Any errors during this process can cause the cell division process to be halted.
Checkpoints occur after certain stages of the cell cycle and each is dependent on whether certain demands are met by the cell. For example, the G1 checkpoint will not allow S-phase (Synthesis of DNA) to take place if it is observed that the DNA of that cell has been damaged in any way. The cell using checkpoints prevent that cell from dividing and multiplying in order not to magnify the problem.
