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1 day ago · t. e. A microorganism, or microbe, [a] is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells . The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.
9 hours ago · The earliest fish with dedicated respiratory gills and paired fins, the ostracoderms, had heavy bony plates that served as protective exoskeletons against invertebrate predators. The first fish with jaws, the placoderms, appeared in the Silurian and greatly diversified during the Devonian, the "Age of Fishes".
9 hours ago · Masker respirator adalah alat perlindungan pribadi yang dirancang untuk melindungi penggunanya dari inhalasi partikel berbahaya, zat kimia, atau patogen penyakit yang terdapat dalam udara. Masker respirator bekerja dengan menyaring udara yang dihirup melalui sistem filtrasi yang efektif, sehingga mengurangi risiko paparan dan potensi kerusakan pada sistem pernapasan. Masker respirator adalah ...
