In the heart and groundbreaking work of Otto Loewi, the heart of a donor frog was stimulated to beat more rapidly than the normal basal rate. When an extract of fluid from the donor frog's heart was administered to the heart of a recipient frog, its heart rate also accelerated. Loewi concluded that :

really dont know just need some points

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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