biology-early development?

0 ⤊

At 4.5 weeks after fertilization, which of the following is/are present in the embryo?

A. neural tube
B. tail
C. heartbeat
D. all of the above

2007-03-24 19:32:51 · 3 answers · asked by Cindie lou 1 in Science & Mathematics ➔ Biology

A. neural tube

It's tough because at 5 weeks is the neural tube, but at 4 no. So after double checking, A looks like the best.

2007-03-24 19:41:27 · answer #1 · answered by Diana M 3 · 0⤊ 0⤋

ITA A

2007-03-25 07:25:57 · answer #2 · answered by gayatri r 3 · 0⤊ 0⤋

2007-03-25 03:31:27 · answer #3 · answered by ag_iitkgp 7 · 0⤊ 0⤋