N 1. In early embryonic development, the cells start to differentiate based on
O a chemicals secreted by the blastocyst.
b. hormones secreted by the uterus.
c. their location.
d. amniotic fluid produced by the placenta.
e. their layer.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.