Divyanshi GuptaHow many bacteria or virus units does it take to develop a disease?Sometimes one is enough. The so-called infectious dose is different for various diseases.Mar 26, 2022Mar 26, 2022
Divyanshi GuptaWhere do crayfish winter?Crayfish winter in the place of their permanent residence. They try to go deeper in late autumn, as the water is warmer in the depths in…Mar 26, 2022Mar 26, 2022