The sanderling is a shorebird that feeds on insects and small crustaceans such as crabs. sanderlings that are beyond breeding age often stay in the southern feeding grounds and do not migrate north during spring and summer. what is the most likely reason that nonbreeding sanderlings remain in the southern feeding grounds?

they are more vulnerable to predators in the tundra region than breeding sanderlings.
they have enough food in the tropical region and are no longer searching for mates.
they have adapted to the warmer weather.
they rear their young on the southern coast.

They have enough food in the tropical region and are no longer searching for mates.

Explanation:

The Sanderling is a energetic, small and plump wading bird. It posses medium  length legs which are black and short straight black bill. It is white underneath and pale grey above. It is native of southern UK but migrate to the coastal regions of south during spring for breeding.

According to the given situation, the members of the Sanderling population which are beyond the breeding age do not migrate as they have enough food  and they have lost the tendency to copulate and search the mates.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.