Answer:
Early in gestation, a fetus has a cartilaginous skeleton that becomes bone in ... At birth, a newborn baby has over 300 bones, while on average an adult human has 206 bones ... It is composed of fibers and granular cells in a matrix. ... The hypertrophic chondrocytes (before apoptosis) secrete vascular endothelial cell growth ...
Explanation
n:When does the fetal cartilage turn to bone?
Key milestones in fetal bone development
Weeks pregnant Milestone
7 weeks Bone outlines for entire skeleton established; cartilage is forming
8 weeks Somites disappear; joints start forming
10 weeks Bone tissue forms and starts hardening (ossification)
16 weeks Your baby can move his limbs
What? Ermmn... Answer to that top question is A.
As energy is transferred through an ecosystem, not all trophic levels receive the same amount. The marine ecosystem consists of primary producers like phytoplanktons; primary consumers like zooplanktons, krill; secondary consumers like leopard seals; and tertiary consumers like killer whales.
Explanation:
In an oceanic or marine ecosystem, the leopard seals are secondary consumers. They basically feed on the primary consumers. They are eaten up by the tertiary consumers. The prey animals of leopard seal includes primary consumers like small fishes, zooplanktons, coral polyps, krill etc. The energy level in the food web increases in a top to down pattern. The producers which occupy the base level will be with high energy and going up the food web, the energy will decrease subsequently. Leopard seals are huge and eat
The answer is active transport