An abiotic factor that could be studied by an ecologist visiting africa is the

When analyzing tree rings, what do scientists assume a thin ring indicates?

Cells destroy body cells infected by a virus or bacteria.

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.