Plants need the water to survive, that's why some plant leaves are big, so it can absorb water.
Answer:
Global warming.
Explanation:
Because it is an ecological problem that could be studied by modeling more easily than by observation or experimentation, because it occurs over a large area and a long period of time
The place in an evolutionary tree or phylogenetic tree that represents a currently living population is denoted by the Tip of this type of diagram.
<h3>What are evolutionary trees?</h3>
The evolutionary trees are diagrams showing the evolutionary relationships between species and/or taxonomic groups that share a common ancestor.
The evolutionary trees have branches where diversification during evolution occurred, nodes where organisms emerged, and one root represented by the common ancestor.
In conclusion, the place in an evolutionary tree or phylogenetic tree that represents a currently living population is denoted by the Tip of this type of diagram.
Learn more about evolutionary trees here:
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Answer:
It's a form of asexual reproduction!
Development of the offspring happens without fertilization in this type of reproduction.
The two main ways in which parthenogenesis happens is by apomixis or automixis. Through apomixis , the egg cells are produced by mitosis. Through In automixis, egg cells are produced by meiosis.
Mitosis = a part of cell cycle: replicated chromosomes are separated into 2 nuclei
Meiosis = type of cell division that reduces the chromosome number by half. So now there is four haploid cells that are genetically distinct from their parent cell.
Example:
An example of an animal that can use this reproduction is a bonnethead shark! Once a shark had a baby in a tank that only had three females!
(read about that on wikipedia)
When a pathogen comes in contact with your body, it has to breach the first line of defense to get inside. Your skin and mucus membranes are the main barrier here. Mucus traps the pathogens, and then is forced out of your body when you cough or blow your nose. Your skin also secretes chemicals that have antiviral properties, killing viruses on contact. If the pathogens get through that defense, the next line is non-specific immunity cells that patrol your tissues engulfing pathogens. There are other cells that do this, like macrophages, but the dendritic cells are most important for activating the third line of defense in your body.
Dendritic cells reside in your tissues, waiting for an invader to arrive. When they do find one, they engulf it and digest it. After they do this, they select pieces of the invader called antigens and put them on their surfaces. The dendritic cells migrate back to lymph nodes, key locations in your body filled with immune cells. There, they show the antigens, called antigen presentation, to two types of lymphocytes, T-cells and B-cells, activating them for a full immune response.
