The answer to your problem is question 3 i just took that test i got it right
1) D chromosomes
2) B a double helix
3)A chromosomes are made of DNA
4)A genes
The Spanish fly is a species of a beetle `
A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate.
System that removes solid and liquid wastes is called excretory system.
Hope this helps~