The types of white blood cells that are available in ones immune system are phagocytes and lymphocytes.
The step that is missing in their methodology is DATA ANALYSIS.
Data analysis is a very important step in scientific investigation. It is the phase of the scientific investigation where the results obtained from the experiment are gathered, examined and analysed in order to obtain necessary information from the data.
The correct answer is - B. Beak size determines what the bird can eat.
The beak of a bird can come in many different shapes and sizes. It can be pointy, long, short, rounded, scythe-like, thin, thick... All of those shapes and sizes have a specific role, and that role is to enable the bird to feed itself with certain type of food source. Every food source requires certain type of beak in order for the bird to be efficient in getting its nutrition, so depending on hat the bird eats, we can easily see a pattern in the beaks, where birds that eat nuts have one strong and shorter beak, the ones that eat warms and insects have thin, pointy one, the predator birds have claw like, sharp beak...
Fixation I believe, hope it helps!!
When a fungus on the roots of a plant helps absorb nutrients it needs from the soil, while the fungus gets what it needs from the plant, this is a single symbiotic relationship. <span />