Etapas del desarrollo fetal.​

This time is divided into three stages, called trimesters.

Explanation:

First trimester, spans from conception to 12 weeks

Second trimester, spans from weeks 13 and 28.

Third trimester, spans from weeks 29 to 40.

https://my.clevelandclinic.org/health/articles/7247-fetal-development-stages-of-growth

i have to report this, it doesn't relate to biology

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.