Search results
Results from the WOW.Com Content Network
Heterospory evolved due to natural selection that favoured an increase in propagule size compared with the smaller spores of homosporous plants. [2] Heterosporous plants, similar to anisosporic plants [clarification needed], produce two different sized spores in separate sporangia that develop into separate male and female gametophytes.
The main difference between spores and seeds as dispersal units is that spores are unicellular, the first cell of a gametophyte, while seeds contain within them a developing embryo (the multicellular sporophyte of the next generation), produced by the fusion of the male gamete of the pollen tube with the female gamete formed by the ...
Sunscreen is regulated as cosmetic product under the State Food and Drug Administration (SFDA). The list of approved filters is the same as it is in Europe. However, sunscreen in China requires safety testing in animal studies prior to approval. [153] Australia. Sunscreens are divided into therapeutic and cosmetic sunscreens.
For more sensitive skin types, I recommend using a physical, mineral-based sunscreen with ingredients like zinc oxide or titanium dioxide as chemical sunscreens are more likely to cause skin ...
The zinc oxide–based sunscreen is also paraben- and fragrance-free, making it great for sensitive skin. It also contains no oxybenzone or octinoxate to help protect those precious coral reefs.
If searching for the main differences between mineral vs. chemical sunscreen, look no further. Discover everything you need to know about mineral and chemical sunscreens.
Salviniales are all aquatic and differ from all other ferns in being heterosporous, meaning that they produce two different types of spore (megaspores and microspores) that develop into two different types of gametophyte (female and male gametophytes, respectively), and in that their gametophytes are endosporic, meaning that they never grow outside the spore wall and cannot become larger than ...
Ecamsule (USAN, trade name Mexoryl SX, INCI terephthalylidene dicamphor sulfonic acid) is an organic compound which is added to many sunscreens to filter out UVA rays. It is a benzylidene camphor derivative, many of which are known for their excellent photostability.