Sam looked at an image of an embryo that is a compact mass of cells. which is the term for this embryo? a)gastrula b)zygote c)morula

The correct answer is option A, that is, gastrula.

Explanation:

The initial multicellular embryo comprising two or more germinal layers of cells from which the different organs are derived later is known as gastrula. The development of gastrula takes place from the hollow, solitary layered ball of cells known as a blastula that itself is the outcome of the cleavage of a fertilized egg.  

An adult multicellular species generally exhibit a concentric alignment of tissues of the body. These adult tissues are obtained from the three embryonic layers of cells known as germinal layers. The process of gastrulation comprises the reshuffling of the cells of the blastula into the three germinal layers, which later turns into different organ systems of the body of the organism.  

straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.