A head lice live on small amounts of blood in the scalp. The host human feels itchiness in their hair as the lice bit and move around. This is an example of what kind of symbiosis? A. Mutualism
B. Commensalism
C. Parasitism

My question says on my assignment. read the following scenarios and decide which of the properties of life are being described. the first one is. katherine stopped on the way to school to grab some donuts. 2. because a dog cannot sweat, it has to pant in order to stay cool. 3. an elephant trun had no bone but 4,000 muscles. i have no idea what i am supposed to anwer. i can't find the answer in my notes or book that i can understand anyway

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

The transport tubes from food came down the plant are called?