A student spends 30 minutes walking outside on a day when the air temperature is 20°C. She then spends 30 minutes walking outside on a day when it is 0°C. On the colder day only, she finds herself very tired when she comes back inside. Explain this observation in detail using your understanding of the concept of homeostasis.

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

can you give me more to work here with plzs and you

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products