Sexual production requires the sperm and egg cell
A is your answer to your question: <span> plants and animals to produce more offspring than can survive </span>
Answer - D. Prokaryotes are only single-celled.
Reasoning - Reason why they are single-celled are unicellular is because they do not have a bound nucleus membrane.
<span>The four muscles, or sets of muscles, that contribute to proper posture to avoid low back pain are the abdominal muscles, hamstrings, erector spinae muscles, and the hip flexor.</span>