Answer:
Their skeletal structure and possibly how they look but usually not. You can also look at the way they live and the biomes they live in.
Explanation:
The answers that best fit the blanks are MATERNAL BLOOD ANALYSIS and ULTRASOUND, respectively. In prenatal diagnosis, there are certain methods that should not be done routinely for the reason that these may injure the fetus, except for routine ultrasound, which checks the status of the fetus, and maternal blood analysis, which assesses the current status of the mother.
Transverse waves contain crests & troughs
while longitudinal waves contains compressions &rarefactions.
The answer is B. hope you get it
