During embryonic development,the establishment of polarity along anterior/posterior,dorsal/ventral,or medial/lateral axis is called:

Which of the following absorbs light energy during photosynthesis?

If a point $P$ moves such that its distances from the point $A(1,1)$ and the line $x+y+2=0$ are equal,then the locus of $P$ is

Which of the following animals possesses a four-chambered heart?

Methanogens belong to:

$A$ force acts on a $3\, g$ particle in such a way that the position of the particle as a function of time is given by $x = 3t - 4t^2 + t^3$,where $x$ is in $meters$ and $t$ is in $seconds$. The work done during the first $4\, seconds$ is .............. $mJ$.