Answer:
Structurally, plant and animal cells are very similar because they are both eukaryotic cells. They both contain membrane-bound organelles such as the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and peroxisomes. Both also contain similar membranes, cytosol, and cytoskeletal elements.
True. This is because they form the lowest parts of the food chain. These invertebrates at young stages are generally exposed to the harsh environments around them. Being organisms that have not developed their mechanisms for protection these invertebrates will be subject to bigger animals and will serve as an easy prey. These invertebrates can be easy prey to larger organisms like birds and frogs, that mostly feed on insects and soft organisms. The saying, "survival of the fittest," is always true when it comes to the ecosystem.
Answer:
not always confined to blood vessels and is under lower pressure than in closed circulatory systems
Explanation:
In an open circulatory system, blood is not always confined to blood vessels and is under lower pressure than in closed circulatory systems. This is because an open circulatory system is a system where blood, may be directly open to the environment in various places throughout the body such as the digestive tract, as opposed to being sealed in arteries and veins. Such a system is mostly found in insects and some animals such as snails or clams.