Which of the following events occurs during the 1st trimester. There is more than 1 correct answer.
Lungs finish forming.
Genitals begin to develop.
Skeleton begins to form bones.
Brain, spinal cord and heart begin to form.
Eyes detect light.

An ecologist is studying the effects that a population of predators is having on a population of a prey. he used data from the field to produce this graph. which conclusion can draw from the graph?

Nucleic acid certain protein cell membranes certain carbohydrates

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated