Answer:
Contract
Explanation:
The main proteins involved in muscle contraction are called actin and myosin.
The primary function of red blood cells is to carry oxygen from the lungs to the body tissues and carbon dioxide away from the tissues and back to the lungs.
Answer:
Heterotrophs compete for the same food source.
Explanation:
Answer:
Red algae - acquired plastids by secondary endosymbiosis
Explanation:
Red algae are believed to have undergo a primary endosymbiosis event. Then a second endosymbiosis event created a large group known as heterokonts. During the primary endosymbiosis event red algae acquire their plastids.