Select one or more: a. Advances in mechanized farming and pest control resulted in rising crop yields per acre (more food grown per farmed acre). b. Air and water pollution that started with large-scale combustion of fossil fuel such as coal since the industrial revolution, and prior to implementation of environmental legislation as of the 1960s resulted in a rising number of associated chronic diseases such as cancer, pulmonary, and cardiovascular diseases. c. The number of children born to each mother declined from 6-10 in 1800 to 2-4 by 1950. d. Advances in medicine led to a dramatic reduction in mortality, particularly infant mortality. e. Changes in weapons technology led to dramatically higher casualty-rates also of civilians during wars, starting with the First World War. f. Technological advances, particularly in irrigation technology and industrial production of fertilizers, allowed for expansion of agriculture onto land that was previously unsuitable for growing of crops.

A,B,D,E,F

Explanation:

A. Improved pest control and mechanized agriculture made agriculture easier and reduced crop destruction thereby increasing the yield

B. Different chronic diseases such as asthma, respiratory and cardiovascular diseases arose from the air and water pollution of the environment.

D. New and improved ways in taking care of patients led to decrease in the death rate of patients.

E.Changes in weapon technology led to improved ways of killing and maiming people at the warfront.

F. With the invention of Fertilizers and Irrigation infertile lands can now be used for Agriculture.

C isn’t correct because population restriction of children wasn’t verifiable and there was no such rule or government policy which took it into consideration

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

answer; i believe the answer is hydraulic action;