The correct answer is option (d) that is dizygotic twins.
The dizygotic twins also known as non-identical twins or fraternal twins, that is, two siblings who come from distinct eggs or ova, which are discharged at the similar time from an ovary and are fertilized by different sperm.
When a spider weaves a web, this is an innate, or instinctual action. A spider needs no training from other spiders (including its parents) to know how to spin a web.
In the beginning, one of the mottos accepted by the animals was, "Four legs good, two legs bad!" In the end, that motto got changed to, "Four legs good, two legs better!"
One of the Commandments originally was, "All animals are equal!" That got changed to, "All animals are equal, but some are more equal than others."
One given by Old Major in the beginning, was "All men are enemies. All animals are comrades." Another one he gave was: "Whatever goes upon two legs is an enemy. Whatever goes on four legs, or has wings, is a friend." <span />
Most crustaceans are aquatic, or reside in water habitats.
Instead of vertebrae, crustaceans have a hard outer shell called an exoskeleton.
They also have segmented bodies, with appendages extending from each segment.
Here's a fun fact: crustaceans have single-chambered hearts and an open circulatory system.
2. A) mitochondria and chloroplasts are the organelles involved with energy conversion.
3. A) Active transport requires energy input from the cell. This is because particles are transported Against the concentration gradient.