Did the congress have the power to tax? yes or no

According to subpart d, research with children may be eligible for exemption when: the children will be asked to complete a surveythe research involves the use of educational teststhe children will be interviewed by the researcher.the research with children will involve participant observation with researcher interaction.

Segregation or discriminatory practices that occur even when there is no explicit legal enforcement

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?