Which type of animal is more likely to die during the earlier life stages because they are major parts of the food chain?
vertebrates
birds
fish
invertebrates

Invertebrates, such as insects, tend to be at lower parts of the food chain so they are likely to be consumed at earlier stages of their life cycles. The likelihood of consumption is higher for lower levels of the food chain since there are more predators for these organisms. 

This is what i found on google“ the monomers combine with each other via covalent bonds to form larger molecules known as polymers. in doing so, monomers release water molecules as byproducts. this type of reaction is known as dehydration synthesis, which means “to put together while losing water. in the process, a water molecule is formed.” i hope this you