Normally conducted seven weeks into the pregnancy, is used to detect structural abnormalities in the fetus and when used later in the pregnancy can determine whether the baby is a boy or a girl.

Ultrasound

Explanation: Ultrasound through the use of Ultrasonic devices are used in medicine to detect objects and measure distances.

explanation:

1 rosales   order

2 eurarya   domain

3 rosaceae   family

4 cania - genus

5 plantae - kingdom

6 magnoliopsida - class

7 rosa - species

8 magnoliophyta - phylum

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.