A tiny filter-feeding barnacle sticks to a whale. The whale is unaffected by this new stowaway. What type of relationship is this?

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

Look at the photo of the leaf. which term best describes this leaf?

Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b. passive c. facilitated d. active b. passive