Joseph studied whether different materials can block certain electromagnetic waves by testing television reception in different parts of the house. at each part of the house, joseph used a different antenna. the experiment could have been improved by


testing reception of a different channel during each trial.


using the same antenna during each trial.


measuring the antenna length in centimeters.


measuring the distance to the television station.

yes bacteria can grow in a mater of time

algae are used in wastewater treatment facilities, reducing the need for greater amounts of toxic chemicals than are already used. algae can be used to capture fertilizers in runoff from farms. when subsequently harvested, the enriched algae itself can be used as fertilizer.

actually there is two main reasons why biologists or scientists general classify things, and they are 1. it enables the organisation of organisms into the 8 kingdoms(kingdom, phylum, class, order, family, genus and species), whichlets the scientists or biologists, see the information about theorganis… (more)