The embryos of complex multicellular animals must establish spatial coordinates in order for development to proceed. an important reference coordinate for developing frogs is the (a) location of the vegetal pole. (b) location of the animal pole. (c) point of sperm penetration. (d) location where gastrulation begins. (e) direction of the sun.

The embryos of complex multicellular animals must establish spatial coordinates in order for development to proceed. On that note an important reference coordinate for developing frogs is the point of sperm penetration into the egg.

Option C

Explanation:

Sperm is an amphibian that reproduces sexually, the point of penetration of the frog sperm into the egg causes the centrosomes of the sperm to act at right angles to the direction of the sperm path, this pushes the sperm towards the egg whereas if this push doesn’t happen then the sperm moves away from the egg.

i think its the first one

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.